5 Best Greenhouse Thermometers and Hygrometers for Keen Gardeners (Summer 2022)

We have reviewed the best greenhouse thermometers and hygrometers on the market and ranked them on our list of favorites.
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Last updatedLast updated: May 22, 2022
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Within a greenhouse environment, the temperature and humidity make the difference between plants thriving and plants dying. This difference can occur with just a degree or two temperature differences for particularly sensitive plants. The good news is that by using a product like the best greenhouse thermometer, you can consistently check that a plant is in the right environment to help it thrive.

In this guide, we have collected the top products of this type, looked at their durability, accuracy, and other important details, and collated real customer feedback. With that information, you have the best possible chance of buying the best thermometer for greenhouse use, avoiding expensive duds that simply don’t meet the mark. Whether you need a thermometer with comprehensive temperature tracking or looking for the smartest option on the market with a Bluetooth connection, you will find those that suit your needs.

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Editor’s Choice

Vauno

Features
  • Transmission range: 200 ft.
  • Indoor temp range: -4°F – 158°F
  • Outdoor temp range: -40°F – 158°F
  • Temp accuracy: ± 1.5°F
  • Humidity accuracy: ±5% RH

Other features: humidity sensor; backlight & LCD touchscreen; auto turn-off; multiple mounting options; battery status indicator; water-resistant

The Vauno Humidity Gauge Meter is a wireless thermometer suitable for use both indoors and outdoors (covered) displaying temperature and humidity ranges, trend arrows, all time and 24 hours, maximum and minimum records. It has a built-in sensor in the main unit, one remote sensor, and the ability to purchase additional sensors. With an outdoor temperature range of -40 to 158 degrees F (outdoors), a temperature accuracy of around 1.5 degrees F, humidity accuracy of around 5%, and an indoor temperature range of -4 to 158 degrees F, there is a lot of information to be gained from the Vauno. Customers will also love that the sensor works up to 200 feet away from the main unit, with both units showing a battery level for easy battery replacement planning.

This product is ideal if you’re looking for a fantastic all-around gauge of any particular environment. You can use the meter in the greenhouse, nursery, garage, self-storage unit, and more. In the greenhouse, it is particularly handy because you can easily act on the displayed levels to make sure your plants are in the perfect growing environment. If you have multiple greenhouses or polytunnels, you can also buy additional remote sensors (up to three) which will synchronize with the main unit, which is really helpful as a management tool.

What stands out?

  • It’s really convenient that the meter has various ways that you can mount it (magnetic back, hanging hold, table stand, wall-mountable, etc.) because it is usable in so many different environments with different mounting options. We also felt the touchscreen is very easy to use and looks great with the LCD backlit display. Also, the unit's price is fantastic for the information you get. Despite it not being a full weather station, it’s really well equipped for the price.

What cons did we manage to find?

  • The meter is not waterproof and should not be placed in direct sunlight. This could make it tricky to place in certain environments, and many customers felt that the lack of waterproof sealing is an impractical aspect of the unit and enough of a reason to rate it below comparable products. Another common issue voiced amongst customers is that the magnets on the back of the unit are not very strong, and if they were stronger, they would be more helpful. Lastly, the unit light is quite low and tricky to read in low light. This preserves the battery light but may make it challenging to use if you garden at times when the light isn’t extremely strong.
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Best Remote Greenhouse Thermometer

ThermoPro TP63B

Features
  • Transmission range: 500 ft.
  • Indoor temp range: -4°F – 158°F
  • Outdoor temp range: -31°F – 158°F
  • Temp accuracy: ± 2.0°F
  • Humidity accuracy: ±2~3% RH

Other features: backlight LCD screen with touchable button; cold-resistant; waterproof; multiple mounting options

If you’re looking for a fantastic greenhouse meter that does it all, the Thermopro TP63B could be a great choice for you. It has a huge 500-foot range, ideal for larger houses and gardens. It is also cold-resistant, waterproof, runs on rechargeable lithium batteries, and has fantastic accuracy with humidity and temperature (indoor and outdoor) even in really cold weather. Customers will love that the large, easy-to-read LCD screen displays current levels as well as trends and all-time records and min/max records, which is helpful when you’re looking to track your greenhouse environment at a glance.

You can compare the Thermopro TP63B with similarly priced items. What does it have to offer that other products don’t? One of the key differences is that it is waterproof, which not all greenhouse meters are. It is also more accurate than comparable products with a range of around 2% or 2 variations of humidity when some units are at least double that either way in their ranges. If you’re particularly keen to have an extremely accurate unit, this is the right option for you. The Themopro is also great in very cold weather, so if you do live in a climate with a variable weather system, it is also a really great meter to consider.

What are our favorite features?

  • We really love how easy to read the LCD screen for all the information you need at a glance. After about a minute of you not using it, the screen also turns off, which is great for battery preservation. We also liked that although the indoor unit uses batteries, the outdoor sensor uses a rechargeable lithium battery which is really easy to charge indoors. Lots of customers were also impressed with the quick accuracy of the product. Within around 24 hours of placing the sensor, it had accurately started registering the temperature and humidity, so there’s no real delay in benefitting from the readings at all.

What could be better?

  • Some customers found that the accuracy was not as expected or hoped for (up to 10 degrees difference), but this was in lots of different placements and will vary depending on the way you use the unit. Another issue is that the outdoor sensor may not last as long as expected between charging, which takes around an hour.
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3
Smartest Greenhouse Thermometer

Govee Bluetooth

Features
  • Transmission range: 230 ft.
  • Indoor temp range: -4°F – 140°F
  • Outdoor temp range: n/a
  • Temp accuracy: ± 0.54°F
  • Humidity accuracy: ±3% RH

Other features: Bluetooth connection; Alert function; 2 secs data refresh speed; portable size

Are you the kind of gardener who loves to use the latest technology to make your life easier? If that sounds like you, the Govee Bluetooth thermo-hydrometer is a great idea. Instead of using the primary information station, it transmits vital home and greenhouse environment from a small sensor that is indoor suitable only. This sensor sends information to an app on your phone via Bluetooth both when you interact with the app and also through alerts. It measures humidity and indoor temperature range and transmits to within 230 feet, helping you provide your plants the best possible living environment.

The Govee Bluetooth is the perfect product for people who love to mix their hobbies and technology. Houseplant parents will particularly appreciate the ability to consistently measure their plant baby’s environment with the information going straight to their phone. With 230 feet range, it is also perfect for polytunnels and greenhouses, only the data doesn’t have to be read on the main station, but instead, it goes right to your phone. What’s better than switching between different social media pages, checking your emails, and then checking in on how snuggly and moist your plants are all from the same place?

What makes it stand out?

  • We love how this device combines smart technology and data collection. It’s a great little gadget that works well with a gardening hobby and is an especially great gift for the plant lover in your life. We also love how compact the sensor is and how it has a massive 500 days battery life, which is really convenient. Compared to other sensors, the device is also really aesthetically pleasing, which can look a little industrial and tool-like.

Which disadvantages must you keep in mind?

  • Some customers felt that the 4-degree inaccuracy with humidity and temperature is not ideal if you have very sensitive plants like orchids or bonsai, which could struggle with very slight temperature changes. Another issue is that the product is not totally compatible with Alexa and doesn’t work well with WIFI either. This could be a problem for those who want to integrate the device fully with other smart home technology.
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4
Most Effective Greenhouse Thermometer

AcuRite

Features
  • Transmission range: 330 ft.
  • Indoor temp range: 32°F – 122°F
  • Outdoor temp range: n/a
  • Temp accuracy: ± 2°F
  • Humidity accuracy: ±3% RH

Other features: calibration; comfort level meter; multiple placement options; area-specific monitoring

The AcuRite monitor is a compact meter designed to measure the temperature and humidity in greenhouses, nurseries, home offices, and other suitable locations. It uses batteries to work and isn’t suitable for outdoor use. When used indoors as directed, it offers highly accurate readings (plus or minus 2 degrees temp, 3 points humidity), as well as offering air comfort indicators letting your know if humidity is OK or in the lower or higher ranges. If you are likely to place the hydrometer in different locations, you will love standing or hanging the product, depending on your needs.

You can compare the product to meters which come with a separate sensor. This item is more of a ‘clock’ feature in that you glance at it in the space that you expect to know the conditions. This area-specific aspect of the product does not diminish its usefulness, but it is worth considering if you want to be able to check the levels in a space without traveling to that location.

Why are we impressed?

  • Many customers felt that the AcuRite is very accurate compared to other meters and were impressed by this. Another impressive piece of feedback is that the item more often than not arrived perfectly calibrated, which saves time. You can calibrate it yourself if this is not the case. Lastly, we loved the easy-to-use compact nature of the product. You can place it anywhere in the greenhouse or amongst houseplants, and it provides all the information you need at a glance.

What negatives must you be aware of?

  • Some customers felt that the screen is too small to read easily, which is exacerbated by the lack of light highlighting the information. The screen information is also not easily read unless you face it straight on, making the information less available overall. Another common issue is that the product does not stand easily, which could be annoying if you try to place it in the right spot in your greenhouse or home.
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Chosen by 2791 people in the past 30 days
9.0
Customer Feedback
Customer Feedback
8.8
Brand Reputation
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8.5
Features & Benefits
Product Review
8.8
9.0
5
Best Digital Greenhouse Thermometer

Smartro SC92

Features
  • Transmission range: 200 ft.
  • Indoor temp range: 14.2°F – 122°F
  • Outdoor temp range: -40°F – 158°F
  • Temp accuracy: ± 0.5°F
  • Humidity accuracy: ±2% RH

Other features: 3 wireless sensors; comprehensive temperature tracking; backlit display; max/min record

The Smartro SC92 hydrometer is a professional piece of equipment designed to give you highly accurate information on the humidity and temperature of the space you place it or up to three wireless sensors in. As well as information on the main unit, which has a large HD LCD backlit screen, you can place up to three sensors up to 200 feet away, giving you the ability to track the conditions in four different spots. Customers who want extremely precise readings will appreciate that the comprehensive device has a temperature accuracy of within 0.5 degrees F and a humidity accuracy or within 2 units.

This product is perfect for anybody who wants an exceptionally accurate and extremely reliable product. It uses a built-in Swiss sensor that can show even the slightest changes in the environment. It is designed to surpass other items on the market with the precise reflection of temperature and humidity. Perfect for situations where you need to be sure of the exact conditions your treasured items and loved ones are in at any one time.

What are its best features?

  • We love that the item is so well designed it can deal with very cold or very warm environments without struggling. The different mounting options are also handy, so you can easily hang it or attach it to various surfaces. Many customers were particularly impressed with how easy it is to see the information on the display at a glance, made even easier in low light with a quick touch to get the backlight engaged.

What could be improved?

  • One of the customers' biggest complaints about the product is that the outdoor sensors are not waterproof. This reduces the product's usefulness to some degree, although not for greenhouse users. Another problem is that the screen does not stay lit for long, so you need to interact with it every time you want to check the conditions. Lastly, many customers felt that the accuracy is not what it should be, based on the claims of the manufacturer; most of this inaccuracy seems to be centered around the outdoor sensors.

Things to Consider

When it comes to buying advanced apparatus needed to do a specific job, it can be tricky to know which product to buy. It is so easy to get something that doesn’t get the job done right. With greenhouse humidity and temperature, accurate readings are essential. For those reasons, we have added this buying guide to help you get an idea of what to look for when you are browsing products. What is the temperature range, and why does it matter? How important is it that the sensor is waterproof? How important is the price? We’ve got answers to those questions and more in this buying guide:

Why Use Greenhouse Thermometer

Humidity and temperature are very important factors when it comes to growing plants successfully, which is why monitoring those factors Trusted Source Instruments for Monitoring the Greenhouse Aerial Environment | New Jersey Agricultural Experiment Station Air temperature can be measured with a common thermometer. Not surprisingly, the thermometer indicates the temperature of the exposed sensor tip, or bulb, which has reached equilibrium with the surrounding environment. horteng.envsci.rutgers.edu in your greenhouse is essential.

Humidity is important because it influences how the plants open the part on the underside of their leaves, called stomata. It is essentially how the plant breathes and cools itself down. When humidity is too high, a plant cannot get rid of excess water through evaporation, and instead, it collects water and rots. The plant may struggle to absorb nutrients it gets through the air. Pests can also be attracted to very moist and rotting plants and substrates.

Plants that need humidity in high levels, such as tropical fruits and plants, will also struggle if the air is not moist enough.

Temperature is important to plants in many ways as warmer temperatures (relative to the plants’ needs) allow photosynthesis, respiration, flowering, germination, and fruiting. Colder temperatures can cause dormancy or may actually kill the plant.

It all depends on the different plant types, but overall, having the ability to protect plants from the cold, to add more moisture to the air, ventilate more, or add shade to cool an environment are all decisions that can come from information about the environment the plants are in. This is why thermometers and hygrometers are essential for a greenhouse – so you have full control over how you care for your plants.

How to Choose the Best Greenhouse Thermometer

To give you an idea of some of the fantastic greenhouse thermometer and hygrometer products out there, we’ve given you in-depth reviews of five currently available to buy. To help you decide which product to buy, here’s a look at key aspects of those products and why they matter:

Remote Access

Some sensors, like the AcuRite, are standalone units that do not enable you to place a sensor into the greenhouse, which you can track from indoors. Overall, this is a matter of convenience for most people. However, if you have multiple growing areas, going to the growing area to check the conditions could be a little annoying and time-consuming. For better remote access, you can choose the Smartro SC92, which comes with three remote sensors, or the Vauno, which comes with one.

Mounting

It is handy to have a product that stands well and can be mounted in multiple ways. Most products can be hung, attached by a magnet, stood on a table, or placed in other useful ways. If you know that you have a specific mounting need, check that the product is compatible before purchase.

Integration with Home Technology

5 Best Greenhouse Thermometers and Hygrometers for Keen Gardeners (Summer 2022)

You can easily monitor the temperature and humidity of your home with the AcuRite thermometer.

For some people, the best digital greenhouse thermometer is a high-tech one, like the Govee Bluetooth. Instead of working with transmitters to a base unit, the best remote greenhouse thermometer – the Govee – uses one small sensor that then relays information to your phone via Bluetooth or WIFI. This is incredibly useful if you want your gardening device to be integrated with your overall home technology. It’s not an issue for those who don’t want growing information on their phone, but if you’re one of the 33 million Trusted Source U.S. houseplants participation 2019 | Statista The statistic shows indoor houseplant gardening participation in the United States from 2010 to 2019. According to the source, an estimated 33.1 million U.S. households participated in indoor houseplant gardening in 2019. www.statista.com and counting houseplant parents who want to monitor the conditions their plant babies are in, the Govee Bluetooth is an easy pick.

Temperature Range

The bigger the temperature range, the better the product is at dealing with weather fluctuations. This is important if you grow sensitive plants or if you live in a climate with very changeable weather. The product needs to be able to handle the lowest and the highest temperatures it may be faced with. If the environment you are in faces extreme temperatures, you may want to consider the Smartro, which lists its ability to deal with extreme temperatures, or the ThermoPro, which is cold-resistant.

Temperature Accuracy

The temperature accuracy is essential in all thermometers, but mainly if your growing projects cannot handle large temperature changes or inaccuracies. Most products don’t vary more than 4 degrees above or below 0. An excellent general inaccuracy is about 2 degrees above or below 0. The best products, like the Smartro have a 0.5 above or below inaccuracy, so if you need the exact temperature, this could be the right product for you.

Humidity Accuracy

5 Best Greenhouse Thermometers and Hygrometers for Keen Gardeners (Summer 2022)

Proper watering and adequate plant spacing, well-drained floors, warming plants, moving air, and venting moisture reduce humidity in greenhouses.

Humidity accuracy will always be a little more than temperature accuracy on either side of the base RH rate. Despite that, the range should not be more than around 4 on either side of that base rate, ideally. The more information you can get regarding humidity, the easier it will be to adjust the humidity in your greenhouse for happier plants.

Water Resistance

Both the ThermoPro and the Smartro have water-resistant sensors, which, although listed as waterproof, need some cover to avoid losing their ability to work properly. This is important to consider if you know that the item will get wet while you water your plants, if you use humidifiers or if you want to monitor the outside temperature for outdoor growing. If this is not important to you, be aware that you don’t need to pay extra for a water-resistant product then.

Screen Use

The screen will usually display the temperature and humidity. It could also display information such as all-time highs and lows, a humidity comfort meter, trends, and further helpful information. The Vauno is an excellent example of a product that shows lots of handy info.

The screen can also be important if you need it to be backlit. Low light or no light can make the product challenging to read at dawn or dusk, or if you garden in winter.

The screen should also have writing on it that is large and comfortable to read, ideally at all angles.

Batteries

Be aware that backlit thermometers will use more battery, so you can get more battery use out of it if you do not need a light on the item.

5 Best Greenhouse Thermometers and Hygrometers for Keen Gardeners (Summer 2022)

The ThermoPro thermometer requires 2 AAA batteries.

It is also important to be wary of features like rechargeable batteries that are generally not very long-lasting on average in products like a greenhouse thermometer. They are handy, but they can be more of a nuisance than changing batteries over, which is quicker, and it is how most greenhouse thermometers are powered.

FAQ

Ideally, it experiences the same conditions as the plants in the area. It should also be quite central to the space in that it is not too high or low. This is because lower spaces are cooler, and higher spots are generally warmer.

If your thermometer can be calibrated, the manufacturer should provide instructions on doing this. You will, however, need an accurate thermometer, such as a mercury thermometer, to calibrate it against.

If you are concerned that your greenhouse thermometer will rust, it is crucial to check that it is built to be rust and water-resistant. Many home thermometers may not be designed to deal with the kind of humidity you get in a greenhouse, so they may not be able to withstand much moisture.

Our Verdict

From the best remote thermometer for the greenhouse to the best greenhouse thermometer and hygrometer combined, we particularly loved the Vauno, Govee Bluetooth, and the Smartro.

The Vauno is the Editors Pick and has all the features you need to be a great gardening buddy with one sensor and a great range of information on the Home Screen. The Govee Bluetooth is the Smartest Tech and the perfect keen gardeners’ sidekick. We also loved the Smartro – our Digital Greenhouse Thermometer nomination – because it is so accurate and makes it easy to keep plants in the best possible environment.

We hope that you can get the very best greenhouse thermometer for your needs with all our handy information above. With the accurate and insightful information they provide, you can ensure your treasured plant projects get the right environment to thrive day after day.

References

1.
Instruments for Monitoring the Greenhouse Aerial Environment | New Jersey Agricultural Experiment Station
Air temperature can be measured with a common thermometer. Not surprisingly, the thermometer indicates the temperature of the exposed sensor tip, or bulb, which has reached equilibrium with the surrounding environment.
2.
U.S. houseplants participation 2019 | Statista
The statistic shows indoor houseplant gardening participation in the United States from 2010 to 2019. According to the source, an estimated 33.1 million U.S. households participated in indoor houseplant gardening in 2019.
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