For any serious gardener, a greenhouse is a sanctuary for nurturing plants. But this controlled environment is only as good as the data you have. Precise monitoring of temperature and humidity is not just helpful—it’s critical for preventing disease, encouraging robust growth, and ensuring your plants thrive rather than merely survive. The wrong conditions can lead to mold, stunted growth, or even the loss of delicate seedlings.
To help you make an informed decision, we’ve researched and compiled a list of the best greenhouse thermometers and hygrometers available. Whether you need a simple, reliable display or a smart device that sends alerts to your phone, there is an ideal tool to help you maintain the perfect climate for your plants. This guide will highlight the key features and benefits of each model to suit various needs and budgets.
Our Top Picks for Greenhouse Climate Monitors
- AcuRite Pro Humidity Meter & Thermometer
- Govee Digital Hygrometer Indoor Thermometer H5075
- AcuRite Wireless Digital Indoor Thermometer
- Govee WiFi Thermometer Hygrometer H5179
- ThermoPro TP55 Digital Hygrometer Indoor Thermometer
- ThermoPro TP50 Digital Hygrometer Indoor Thermometer
- Govee Thermometer Hygrometer H5102 for Wine Cellar
- SensorPush HT1 Wireless Thermometer/Hygrometer
AcuRite Pro Humidity Meter & Thermometer
For gardeners who value simplicity and reliability, the AcuRite Pro is a fantastic choice. Its enhanced accuracy ensures you get a precise reading of your greenhouse climate, updating every 10 seconds to reflect even minor fluctuations. The touch-activated backlight is a practical feature for checking conditions during early mornings or late evenings without needing extra lighting.
This model offers excellent flexibility with its multiple mounting options. You can place it on a flat surface like a potting bench or use its powerful magnet to attach it to a metal greenhouse frame. This versatility allows you to position the monitor exactly where you need the most accurate environmental reading for your specific plants.
Govee Digital Hygrometer Indoor Thermometer H5075
Step into smart gardening with the Govee H5075. This device connects to your smartphone via Bluetooth, allowing you to monitor your greenhouse conditions from up to 164 feet away. You can view real-time data, set custom alerts for when temperature or humidity goes outside your preferred range, and even check historical data graphs to understand daily climate patterns.
Beyond its connectivity, the Govee H5075 boasts a high-quality Swiss-made sensor for exceptional accuracy. The display is large and easy to read, showing not only current readings but also comfort indicators (dry/comfort/wet) and records of maximum and minimum values. With two years of data storage, it’s an excellent tool for tracking the long-term health of your greenhouse environment.
AcuRite Wireless Digital Indoor Thermometer
The AcuRite 00613 is a straightforward and effective tool for any gardener. Its simple, easy-to-read display shows the current temperature and humidity at a glance, making it a no-fuss addition to your greenhouse. This basic functionality is perfect for those who want reliable data without the complexity of smart features or app connectivity.
This model helps you understand the daily climate range in your greenhouse by tracking the high and low readings for both temperature and humidity. Knowing the extremes your plants experience is vital for diagnosing issues like heat stress or excessive moisture. It’s a practical device that pairs well with humidifiers or dehumidifiers to help you maintain a stable growing environment.
Govee WiFi Thermometer Hygrometer H5179
For the ultimate in remote monitoring, the Govee H5179 with WiFi connectivity is a top contender. Unlike Bluetooth models, this device allows you to check your greenhouse conditions from anywhere in the world with an internet connection. This is ideal for gardeners who travel or want to keep an eye on their plants while at work, providing true peace of mind.
The device syncs data directly to the cloud, so you can review temperature and humidity trends over time without being near the sensor. You can set smart alerts to receive push notifications on your phone if conditions fall outside your preset parameters, enabling you to take quick action to protect your plants from a potentially damaging environment.
ThermoPro TP55 Digital Hygrometer Indoor Thermometer
The ThermoPro TP55 stands out with its large, easy-to-read screen that displays a comprehensive set of data. It shows current, maximum, and minimum records for both temperature and humidity simultaneously, giving you a complete picture of your greenhouse’s climate at a single glance. This can help you quickly assess the conditions your plants have experienced throughout the day.
Designed for clarity and user-friendliness, the TP55 features a face icon indicator that shows the comfort level of the environment—smiley face for comfort, sad face for too dry or too wet. With its high accuracy and fast refresh rate, this model is a reliable workhorse for gardeners who need detailed, at-a-glance information without connecting to an app.
ThermoPro TP50 Digital Hygrometer Indoor Thermometer
The ThermoPro TP50 is a compact and highly affordable option that doesn’t compromise on essential features. It provides accurate temperature and humidity readings with a clear LCD screen. Its small footprint makes it easy to place anywhere in the greenhouse without taking up valuable space on your seedling trays or workbenches.
This model tracks high and low records and uses a simple comfort indicator to let you know if the environment is too dry, comfortable, or too wet. For gardeners on a budget or those who need multiple sensors for different zones within a large greenhouse, the TP50 offers exceptional value and reliable performance.
Govee Thermometer Hygrometer H5102 for Wine Cellar
While marketed for wine cellars, the Govee H5102 is equally capable in a greenhouse environment. Its design focuses on precision and stability, which are critical for both preserving wine and nurturing plants. The device offers a clear display and reliable tracking of environmental conditions, making it a versatile monitoring tool.
Its sleek design and accurate sensors make it a good fit for a gardener who appreciates a more discreet or aesthetically pleasing monitor. You can trust it to deliver consistent readings, helping you maintain the steady conditions that many delicate plants and seedlings require for optimal growth.
SensorPush HT1 Wireless Thermometer/Hygrometer
The SensorPush HT1 is a professional-grade, wireless sensor that is perfect for serious gardeners and horticulturists. It’s incredibly small and waterproof, allowing you to place it in tight spaces or areas with high humidity without worry. The sensor communicates via Bluetooth to your smartphone, providing highly accurate data through a sophisticated app.
The accompanying app provides rich, graph-based data visualizations and allows for extensive data logging and export. This is invaluable for analyzing long-term trends, conducting experiments, or simply maintaining detailed records of your greenhouse’s climate. For those who need laboratory-grade accuracy in a rugged, portable package, the SensorPush is an excellent investment.
Buying Guide: How to Choose the Best Greenhouse Thermometer and Hygrometer
Keeping my greenhouse environment in check is one of the most important parts of my gardening routine. Getting the right thermometer and hygrometer makes all the difference between thriving plants and constant struggles. Over the years, I’ve learned what really matters when picking one out, and it goes beyond just the numbers on the screen.
First, I always think about accuracy. What’s the point of having a device if I can’t trust its readings? I look for models that specify their margin of error for both temperature and humidity. Even a few degrees or percentage points off can lead me to make the wrong decision for my heat-sensitive orchids or humidity-loving ferns. For me, a reliable sensor is non-negotiable.
Next, I consider the display and readability. My eyes aren’t what they used to be, and squinting at a tiny screen from across the greenhouse is a pain. I prefer a large, clear LCD with a backlight, so I can do a quick check early in the morning or after the sun goes down. Some models even have a feature that shows the high and low readings from the last 24 hours, which is incredibly helpful for spotting trends.
Durability is another big one. A greenhouse is a tough environment—it’s humid, the temperature swings wildly, and water is always a risk. I look for devices with a good IP (Ingress Protection) rating, which tells me how well it’s sealed against dust and moisture. An IP67 rating, for example, means it can handle being submerged in water temporarily, which is great for peace of mind.
Finally, I decide between a simple, standalone unit and a more advanced system. A basic indoor/outdoor thermometer with a probe is perfect for my small hobby greenhouse. But for my larger setup, I invested in a Wi-Fi enabled system that sends alerts directly to my phone if the temperature drops too low or the humidity spikes. This connectivity lets me relax, knowing I’ll be notified of any problems immediately, even when I’m not at home. Choosing the right device is all about matching its features to my specific needs and the size of my operation.
FAQ
Where is the best place to put a thermometer in my greenhouse?
I always place my main thermometer in a central location, away from direct sunlight and the door. Hanging it at plant height gives me the most accurate reading of the conditions my plants are actually experiencing. If it’s in direct sun, the reading will be artificially high, and if it’s right by the door, it will be affected by every draft.
How often should I check my greenhouse thermometer and hygrometer?
I check my readings 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 are at their peak. This helps me understand the daily range my plants endure. With a smart device that logs data, I can review the highs and lows even less frequently, but I still like to glance at it regularly.
Can I use a regular indoor hygrometer in my greenhouse?
You can, but I don’t recommend it for the long term. Standard indoor hygrometers aren’t built to withstand the constant high humidity and temperature fluctuations of a greenhouse. They can become inaccurate quickly or fail altogether. It’s worth investing in a model designed for horticultural or heavy-duty use to ensure you get reliable data for your plant health.
What is the ideal temperature and humidity for a greenhouse?
This depends entirely on what you’re growing! My tropical plants prefer a warm and humid environment, around 75-85°F (24-29°C) with 70-80% humidity. My seedlings, on the other hand, need it a bit cooler and less humid to prevent damping-off disease. I always research the specific needs of my plants, but a good general range for many common plants is 65-80°F (18-27°F) with 50-70% humidity.
Why do I need both a thermometer and a hygrometer?
I need both because temperature and humidity are deeply connected. A high temperature can make high humidity feel even muggier for my plants, increasing the risk of fungal diseases. Conversely, low humidity with high temperatures can cause plants to dry out too quickly. Knowing both values helps me make the right adjustments, like turning on a fan or opening a vent, to create the perfect balance. For me, managing these two factors is the foundation of maintaining a healthy greenhouse environment.