10 Best Smart Thermometer For Greenhouse 2026 in the United States

The ThermoPro TP350 is a Bluetooth-enabled indoor thermometer and hygrometer that offers reliable monitoring of temperature and humidity, which is essential for greenhouse conditions. It measures temperatures up to 140°F, which should be adequate for most greenhouse environments but may be limiting if your greenhouse experiences higher temperatures. Its temperature accuracy of about ±0.9°F and humidity accuracy of ±2% RH are quite good for general plant care, helping you keep track of conditions precisely. The device connects via Bluetooth and provides up to 260 feet of range, allowing you to monitor your greenhouse remotely through the ThermoPro app without needing to register an account, which is a plus for privacy.

One standout feature is the ability to store and export data for up to two years, letting you review trends and adjust your greenhouse environment proactively. The large, backlit display with comfort icons makes it easy to glance at current conditions, even in low light. However, the device runs on AAA batteries, which means you’ll need to replace them periodically, and it doesn’t include additional sensors like soil moisture or light, which some greenhouse users might find useful. While this product is primarily designed for indoor use, it can still serve well in a greenhouse that is not exposed to harsh outdoor elements.

If you want a straightforward, accurate, and easy-to-use monitor for temperature and humidity with solid data tracking, the ThermoPro TP350 is a strong contender, especially given it comes in a two-pack for monitoring multiple locations.

The Govee WiFi Thermometer Hygrometer H5103 is a solid choice if you want to keep a close eye on temperature and humidity in your greenhouse remotely. It offers accurate temperature readings within ±0.3°C and humidity accuracy of ±3%RH, which is good enough for most plant-growing needs. Connectivity is a strong point — it supports both Wi-Fi and Bluetooth, allowing you to check conditions in real-time from anywhere via the Govee app. However, it doesn’t support 5G Wi-Fi, so make sure your network is 2.4 GHz. The electronic ink display is clear and easy to read without draining much battery, which can last up to six months on included AA batteries. You can set alerts for temperature or humidity to get notified if conditions go outside your preferred range, helping you react quickly to protect your plants. The app also stores data for up to two years and lets you export it, useful if you want to track and analyze your greenhouse environment over time.

Its temperature range starts at 32°F (0°C), so it may not capture colder conditions if your greenhouse goes below freezing. There are no additional sensors beyond temperature and humidity, so you won’t get information like soil moisture or CO2 levels. This product fits well for home gardeners or small greenhouse owners who want reliable remote monitoring without complex setups, but if you need more advanced sensing or a wider temperature range, you might want to look at other options.

The Govee Indoor Hygrometer Thermometer is a solid choice for those looking to monitor temperature and humidity levels, especially in a greenhouse setting. One of its standout features is its impressive accuracy, with temperature readings precise to ±0.54°F and humidity levels to ±3%RH. This level of accuracy is crucial for maintaining the ideal conditions for plant growth. Additionally, with a fast refresh rate of just 2 seconds, you’ll always have up-to-date information at your fingertips.

Connectivity is another strength, as the thermometer uses Bluetooth with a range of up to 196 feet, allowing you to receive immediate alerts through the Govee Home app if your preset temperature or humidity thresholds are breached. This feature ensures that you can take prompt action to protect your plants.

The large 3-inch LCD display is user-friendly, making it easy to read the current conditions at a glance. Plus, the ability to log data over 2 years and view it in a clear graph format can be beneficial for tracking trends in your greenhouse environment. However, the device operates on batteries, which means you'll need to keep an eye on battery life and potentially replace them over time. Additionally, while it offers 20 days of online data storage, some users may prefer unlimited storage for ongoing monitoring.