Maintaining the perfect environment is crucial for a thriving greenhouse, and that starts with precise monitoring. The right thermometer does more than just tell you the temperature; it provides the essential data needed to protect your plants from damaging frosts, excessive heat, and incorrect humidity levels. Without accurate readings, your careful cultivation efforts could be compromised.
From simple analog gauges to advanced smart sensors that connect to your phone, the options are vast. This roundup cuts through the noise to bring you the top-performing greenhouse thermometers. We’ve evaluated them based on accuracy, range, connectivity, and specialized features to help you find the ideal tool for your gardening success.
The Best Greenhouse Thermometers for Your Garden
- SMARTRO SC92 Professional Indoor Outdoor Thermometer
- Govee Bluetooth Hygrometer Thermometer with App Alerts
- AcuRite Wireless Digital Indoor Thermometer and Hygrometer
- Govee WiFi Temperature Sensor H5179 with App Notification
- ThermoPro TP50 Digital Hygrometer Indoor Thermometer
- HT1 Smart Temperature Sensor and Humidity Sensor
- Govee Digital Hygrometer Indoor Thermometer Room H5075
- AcuRite Pro Accuracy Temperature and Humidity Gauge
- ThermoPro 650 ft Wireless Meat Thermometer Digital
- AcuRite Wireless Remote Monitoring System
SMARTRO SC92 Professional Indoor Outdoor Thermometer
For gardeners who demand the highest level of precision, the SMARTRO SC92 is a top contender. It uses a world-leading Swiss sensor to deliver readings within a remarkable 0.5°F and 2% RH, even in extreme conditions. This device comes pre-calibrated and offers a manual calibration option, ensuring your data remains accurate over time.
Its versatility is a major advantage for monitoring larger greenhouse setups. You can connect up to three remote sensors to the main display unit, allowing you to track conditions in four different locations up to 200 feet apart. Furthermore, the comprehensive tracking feature records the highest and lowest temperatures and humidity levels from the previous 24 hours or of all time, helping you identify patterns and potential issues.
Govee Bluetooth Hygrometer Thermometer with App Alerts
Stay connected to your greenhouse conditions without being physically present with the Govee Bluetooth Thermometer. It provides a stable 230-foot Bluetooth range, allowing you to check real-time temperature and humidity data directly on your phone through the Govee Home app. This is ideal for making quick checks from your home.
Accuracy is assured with its Swiss-made sensor, which provides precise readings. One of its most valuable features is the intuitive alert function. You can preset your desired temperature and humidity ranges, and the app will send you an instant notification if conditions fall outside those parameters. This allows for a rapid response to sudden changes that could harm your plants.
AcuRite Wireless Digital Indoor Thermometer and Hygrometer
If you prefer a straightforward, reliable monitor without a smartphone app, the AcuRite Wireless Digital Thermometer is an excellent choice. Its simple, easy-to-read display shows the current indoor temperature and humidity at a glance, making it user-friendly for any gardener.
This device helps you understand the range of conditions in your greenhouse by displaying the daily high and low readings for both temperature and humidity. This information is vital for assessing the overall stability of your plant environment and making informed decisions about ventilation, heating, or shading.
Govee WiFi Temperature Sensor H5179 with App Notification
For the ultimate in remote monitoring, the Govee WiFi Temperature Sensor is a powerful tool. It connects directly to your WiFi network, enabling you to check real-time conditions from anywhere with an internet connection. This is perfect for gardeners who travel or want to monitor their greenhouse while at work.
It features a fast-refreshing Swiss sensor and supports data storage and export for up to two years, allowing for long-term analysis of your greenhouse climate. The app alert function notifies you immediately if levels fall out of your preset range. This model also now supports a widget function for even quicker glances at your data.
ThermoPro TP50 Digital Hygrometer Indoor Thermometer
The ThermoPro TP50 is a popular and highly effective digital hygrometer that provides excellent value. It features a clear air comfort indicator that displays DRY/COMFORT/WET zones, allowing you to assess your greenhouse’s humidity level instantly.
With a high accuracy of ±1°F and ±2-3% RH, and a data update every 10 seconds, this device is well-suited for tracking the fluctuating conditions common in greenhouses. It also records the high and low temperature and humidity readings, so you are always prepared for environmental changes.
HT1 Smart Temperature Sensor and Humidity Sensor
The SensorPush HT1 is designed for users who need detailed, professional-grade environmental data without a complicated setup. It connects via Bluetooth to a user-friendly app and begins recording temperature, humidity, dew point, and VPD (Vapor Pressure Deficit)—a critical metric for advanced growers.
It stores 20 days of data on the sensor itself and offers unlimited storage within the app. For those who need remote access beyond Bluetooth range, you can add a separate WiFi Gateway to view your data from anywhere in the world and store it permanently in the cloud.
Govee Digital Hygrometer Indoor Thermometer Room H5075
This model from Govee strikes a great balance between a clear physical display and smart app functionality. It features a 3-inch bright LCD screen with large numbers, making it easy to read from a distance. The display also shows comfort indicators and max/min records.
Through the Govee Home app, you can access remote monitoring, view historical data graphs, and receive alert notifications via a 164-foot Bluetooth connection. Its Swiss-made sensor ensures high accuracy and a fast 2-second refresh rate to keep you updated on the latest changes.
AcuRite Pro Accuracy Temperature and Humidity Gauge
The AcuRite Pro Accuracy Gauge is built for those who trust a dedicated display with professional-grade precision. It provides an impressive accuracy of ±0.5°F and ±2% RH and includes a manual calibration option for maintaining that accuracy long-term.
It measures conditions every 10 seconds to quickly identify any changes in your greenhouse environment. The display shows not only the current readings but also the high and low records for the past 24 hours and for all-time, giving you a comprehensive view of your climate trends.
ThermoPro 650 ft Wireless Meat Thermometer Digital
While designed for grilling, the ThermoPro TP650’s long-range Bluetooth and probe-based design offer a unique solution for greenhouse monitoring. Its 650-foot range is one of the longest available, providing a strong and stable connection from your house to a distant greenhouse.
It comes with two probes, which could be used to monitor temperature in two different zones within the greenhouse, such as a seedling table and a mature plant section. The simple app allows for custom alarms, notifying you when temperatures reach a set threshold without requiring WiFi or registration.
AcuRite Wireless Remote Monitoring System
For the most comprehensive monitoring solution, the AcuRite Wireless Remote Monitoring System is designed to track conditions across a large property. This system typically includes multiple sensors that transmit data to a central display, allowing you to monitor your greenhouse, garden, and other outdoor areas simultaneously.
It provides a complete picture of your microclimates, which is invaluable for making precise adjustments to your gardening strategy. By comparing data from different locations, you can better understand how weather affects various parts of your garden and protect your plants more effectively.
Buying Guide: How to Choose the Best Greenhouse Thermometer
As someone who spends a lot of time in my greenhouse, I know that getting the temperature right is a big deal. It is not just about sticking any old thermometer on the wall; you need one that gives you a true picture of your plants’ environment. The wrong temperature can stunt growth, prevent germination, or even cook your plants on a hot day. So, let us talk about what I look for when picking out a tool to monitor my greenhouse climate.
First, you need to decide between analog and digital. Old-school analog thermometers, like the classic glass tube or dial types, are simple, reliable, and do not need batteries. I like them for a quick, at-a-glance check. However, they can be less precise and sometimes harder to read from a distance. Digital thermometers, on the other hand, are my go-to for precision. They give you a clear, exact number and often come with extra features. Many digital models have remote sensors, so I can check the temperature from my house, and some even track highs and lows, which is super helpful for understanding the daily temperature swings in your greenhouse.
Next, think about placement and range. Your greenhouse likely has microclimates—it might be warmer up high and cooler near the ground. I use a thermometer with a probe on a long wire to measure soil temperature for seedlings, and another one to monitor the air temperature at plant level. Make sure the thermometer’s range fits your climate. If you live somewhere with cold winters, you will need one that reads well below freezing. For hot summer areas, a high maximum reading is essential.
Durability is non-negotiable. Greenhouses are tough environments with high humidity, constant sun exposure, and potential for water splashes. I always look for thermometers that are weatherproof or at least water-resistant. A sturdy casing and a shatter-resistant display are must-haves. For me, the best greenhouse thermometers are the ones that can handle these conditions year after year without failing. Finally, consider extra features that make your life easier. A built-in hygrometer to measure humidity is incredibly valuable, as humidity control is just as important as temperature. Wireless connectivity and apps are great for keeping an eye on things when I am away. By thinking about these factors—type, placement, durability, and features—you can find a tool that will help you create the perfect growing environment. Getting an accurate reading is the first step to a thriving greenhouse.
Frequently Asked Questions
Where is the best place to put a thermometer in my greenhouse?
You want to measure the temperature where your plants are, not where it is most convenient for you to look. I always place my main thermometer at plant level, in a spot that gets average sunlight and is shielded from direct, intense rays which can skew the reading. Avoid putting it right next to a door or vent, as those areas will not reflect the overall climate. For a complete picture, I actually use two: one for air temperature in a central location and another with a probe to check my seedling soil temperature.
How often should I check my greenhouse thermometer?
I check my greenhouse temperature at least twice a day—once in the early morning when temperatures are typically at their lowest, and again in the mid-afternoon when they peak. This helps me understand the daily range my plants experience. If I am germinating seeds or nurturing delicate seedlings, I might check it even more frequently. A thermometer with a min/max memory function is a huge help here, as it records these extremes automatically, so I do not have to constantly watch it.
Can I use a regular indoor/outdoor thermometer in my greenhouse?
You can, but it might not last as long. Standard outdoor thermometers are built for general weather conditions, but a greenhouse presents a special challenge with its consistently high humidity and potent UV exposure. I prefer using a thermometer specifically rated for greenhouse or horticultural use because they are built with materials that can resist moisture damage and sun fading. This small investment usually means the device will be more reliable and accurate over time.
What is the ideal temperature range for a greenhouse?
This depends entirely on what you are growing! Most common vegetables like tomatoes and peppers prefer daytime temperatures between 70-80°F (21-27°C) and nighttime temps no lower than 55-60°F (13-16°C). Tropical plants will want it warmer, while cool-weather crops like lettuce can handle it cooler. The key is consistency and avoiding sudden swings. Doing a bit of research on your specific plants’ needs is the best way to set your targets. A good thermometer helps you maintain that perfect range.
Why is it important to also monitor humidity in my greenhouse?
Temperature and humidity are a team; you really cannot manage one effectively without considering the other. High humidity combined with high temperatures can create a breeding ground for fungal diseases like powdery mildew. If the air is too dry, your plants can become stressed and lose water too quickly. Many of the best greenhouse thermometers come with a built-in hygrometer to measure humidity. Keeping an eye on both metrics gives you the full picture of your greenhouse environment and allows you to make adjustments, like ventilating to reduce humidity on a stagnant day.