A greenhouse thermometer is a must-have accessory for every greenhouse enthusiast. Monitoring the temperature evolutions in your greenhouse is extremely important to help you crops grow. During summer, you don’t want your greenhouse to overheat and during winter you need to protect your plants from frost. The ideal temperature for your greenhouse? That depends on the crops you’re growing. Make sure you do some research as to which temperature ranges create good conditions for your veggies.
Take a look at this video that explains the optimal greenhouse conditions:
Temperature might be the first factor you need to monitor, but humidity is a close second. It’s important to know the amount of water vapor in the air as some plants will need a more or less humid environment to grow optimally.
Luckily both of these are easy to measure, all you need is a digital greenhouse thermometer and hygrometer!
Digital greenhouse thermometers and hygrometers
When you want basic greenhouse temperature monitoring, we recommend you to buy a wireless min/max digital thermometer. This greenhouse thermometer will tell you the minimum and maximum temperature of a certain timeframe (usually 24 hours). It allows you to keep a close eye on the temperature inside your greenhouse. Depending on your climate, there’s a huge difference between a sunny day and a chilly summer night. That’s why a good insight into the highest and lowest temperatures is essential.
While you can go for a traditional, analog model, we suggest you go for the more advanced digital thermometer. It will make your life so much easier. While a traditional thermometer might be cheaper, we feel it’s definitely worth the slightly larger investment to go for a digital model.
A big benefit of the digital thermometer is that it’s usually combined with a hygrometer, so you won’t have to invest in two separate measuring devices. You will quickly see the current temperature and humidity into one display. It just takes a daily check to see whether the conditions in your greenhouse are ideal for your veggies and plants to grow. The good news is that these digital greenhouse thermometers are very affordable. You’ll find a basic one for around $20, so there’s really no good reason not to invest in one!
Recommendation: The ThermoPro TP65 Indoor Outdoor Thermometer
The ThermoPro TP65 is a wireless digital thermometer with an easy to readout display because of the large numbers and the backlight. The device measures temperature and humidity in indoor or outdoor greenhouses within a 200ft/60m remote range. It is possible to use up to 3 transmitters with the devices that sync with each other.
Advantages
- Budget friendly
- Easy readout because of the large numbers, easy to read from a distance as well
- Units sync with each other
- Capacity of 3 transmitters
- Easy to set up
- Can be read in the dark
- 200ft/60m remote range indoor/outdoor
- Magnetic back to mount and tabletop
Disadvantages
- Needs extra Lithium batteries in extreme cold
- Transmitter does not have screws on the back to install
- Accurate temperature and humidity measurement
- Cold-resistant and weatherproof (transmits temperature / humidity in rain or snow even as cold as -31°F
- 200 ft remote range, capable of strong signal penetration
- Large easy to use backlit touchscreen of 4”
- Maximum and Minimum records at all time
Recommendation: The AcuRite Digital Hygrometer
The AcuRite is a budget-friendly thermometer and hygrometer that provides accurate readings of your greenhouse. After manual calibration, the device shows the high and lows of the last 24 hours on a large and easy to read display that can stand upright on its own with a magnetic latch.
Advantages
- Very budget friendly
- Shows highs and lows of the last 24 hours
- Includes magnets for mounting
- Very accurate
- Large and easy to read display
- AAA-batteries
- Can stand upright on its own
Disadvantages
- Needs to be re-calibrated every couple of years
- Calibration needs to be done manually
- Accurate temperature and humidity measurement
- Indicates low, high and ok humidity
- Indoor humidity control to ensure a healthy home environment
Recommendation: The ThermoPro TP50 Digital Hygrometer
The ThermoPro TP50 is a very accurate digital hygrometer and thermometer. It is easy to calibrate and install on the table with the tabletop stand or on the wall with the magnetic back mount. The display unfortunately has no backlight to read in the dark.
Advantages
- Very accurate
- AAA-batteries included
- Quickly calibrated
- No setup needed
- Tabletop stand and magnetic back to mount
Disadvantages
- Not handy with monitoring fluctuations throughout the day
- Shorter life-span than other thermometers
- No backlight
- Accurate temperature and humidity measurement
- Air comfort indicator that shows dry, comfort or wet
- Displays accurate high and low indication of temperature / humidity
- Indoor humidity control to ensure a healthy home environment
Wifi greenhouse thermometers
The newest models of greenhouse thermometers and hygrometers come with an app on your smartphone, to keep track of statistics and monitor the temperature constantly. Some of them will even alarm you on certain weather conditions.
These wifi greenhouse thermometers are my favorite at the moment. They help you monitor your greenhouse temperature and humidity in the easiest possible way and are less expensive than a full-blown greenhouse weather station.
Recommendation: The SensorPush HT1 Wireless Thermometer/Hygrometer
The SensorPush HT1 is a small wireless thermometer and hygrometer that measures your greenhouse in a range of 325 feet. It is easy to set up the data with the app, that is available for IOS and Android. The devices stores at least 20 days of temperature and humidity in graphs, that are possible to export to Excel or Google Sheets. To keep the data online, it is necessary to buy the Hub as well.
Advantages
- Export data to CSV for analysis with Excel, Google Sheets
- Small design
- Bluetooth range of 325 feet
- Easy one-time setup with the free app (iOS & Android)
- Great connectivity
- Batteries last one year and can be replaced easily
- Stores at least 20 days of temperature and humidity
- Very easy to set up
- Great client service
Disadvantages
- Not waterproof
- Complex graphs
- Will not keep data online without Hub
- Not possible to make the alert in the app louder or longer
- Easy to install with iOS and Android app
- Remote monitoring on smartphone
- Highly accurate Swiss-made sensor
- Receive push notifications and alerts if there’s a problem
- Very prompt and friendly customer service
Recommendation: The Govee WiFi
The Govee WiFi is a very accurate temperature and humidity monitor that can give temperature readings via voice commends with Alexa. The devices provides a 20-day onboard view and 2 years of cloud data storage. The readings can be viewed on a distance as well through WiFi. The device also sends outs smart alerts when the temperature or humidity in the greenhouse drops. The display unfortunately has no backlight to read in the dark.
Advantages
- Works with Alexa → makes it possible to get temperature readings via simple voice commends
- Wifi Wireless monitor
- Smart message alerts if temperature or humidity drops
- Features a 20-day onboard view and 2 years of cloud data storage
- Very accurate
- Easy setup
- Possible to view readings from a distance with wifi
- Great client service
- USB-chargeable
Disadvantages
- No light screen for night
- Easy to install and manage with Govee Home app for iOS and Android
- Works with Alexa: Get temperature and humidity reading via simple voice command
- WiFi wireless monitor allows to remotely check temperature and humidity
- Highly accurate Swiss-made sensor
- Receive alert messages on your phone and correct the situation even from a distance
- Data storage export (20 days on-board and 2 years cloud data storage)
Greenhouse weather stations
Are you really passionate about monitoring the weather conditions both inside and outside your greenhouse? Do you grow plants that are very temperature or humidity sensitive? Are you just a little bit of a tech freak who likes to install the best gadgets? A greenhouse weather station is a next level greenhouse thermometer.
Not only will it predict weather conditions and tell you the outside temperature, but it will also give you an extremely detailed view of all parameters that could influence your greenhouse and plants. In these weather stations, you have all sorts of categories, from a real semi-professional home weather station that will cost you up to $300 to a basic one for less than $50.
Recommendation: The ThermoPro TP67B Waterproof Weather Station
The ThermoPro TP67B is a waterproof and cold resistant weather station for indoor and outdoor gardening. The station can be used to monitor temperature and humidity and predict the upcoming weather. The station can be synchronized with up to 3 rechargeable outdoor remote sensors. This kind of station doesn’t use gps to locate the sensors. Keep in mind also that arometric pressures are not corrected to sea level.
Advantages
- Cold resistant and waterproof sensor
- Weather forecast
- Wireless
- Possible to synchronize up to 3 rechargeable outdoor remote sensors
- Large display
- Very accurate
- Easy setup
- USB-chargeable
Disadvantages
- Order display is not logical (outside temperature on the top)
- Buttons on the rear, not easily accessed
- This unit does not determine its location by gps
- Barometric pressures are not corrected to sea level
- Cold-resistant and weatherproof rechargeable remote sensor
- Provides weather forecasts using vivid icons for sunny, partially cloudy, cloudy, rainy and snow
- Alerts you of changes to your environment
- Large 4″ LCD display with a backlit button for easy reading in dim light
Recommendation: The Tempest Weather System
The Tempest Weather System is a solar-powered outdoor sensor for greenhouses with a built-in wind meter, rain gauge, barometer and that provides accurate weather forecast. The devices offers wireless transmission to hub up to 1000+ ft and updates every three seconds. The data can be seen by using the app or the website. The weather system doesn’t have a physical display.
Advantages
- Solar-powered outdoor sensor with wireless transmission to hub up to 1000+ ft and updates every three seconds.
- Easy setup
- Strong connection with Wifi, even from a distance
- Very accurate readings for temperature, humidity, barometer, UV
- Solar charging
- App is very straight forward
- Compact unit that is easy to mount
Disadvantages
- More expensive option
- Doesn’t measure rain very accurate
- Durability could be better
- No physical display → you need to use the app or website
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- Advanced greenhouse / home weather station, very easy to install
- No-moving parts to wear out, precision sonic anemometer, instantaneous haptic rain sensor
- Solar powered, super long-range outdoor wireless sensors (1000+ ft)
- Instantly online with free iOS and Android app
- Uses AI algorithms to continuously fine tune accuracy and forecast conditions
Curious to find out which other greenhouse accessories will make your life easier? Take a look at our 5 must-have greenhouse accessories!
