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 GoveeLife WiFi Hygrometer Thermometer Sensors 3 Pack is a solid choice for those needing to monitor temperature and humidity in a greenhouse. It offers good accuracy, with temperature readings precise to about ±0.3℃ and humidity accuracy within ±3% RH, which is reliable enough for most plant-growing environments. The sensors connect via WiFi to an app that lets you check conditions remotely, set alerts for changes, and receive notifications by app or email—helpful for catching issues early. With data stored for up to two years and trends viewable for 20 days, you can track your greenhouse environment over time and export the info if needed. The long battery life (about 2 years on included AAA batteries) means less frequent replacements, which is convenient. The compact design also makes it easy to place sensors in various spots.

However, it only works with 2.4GHz WiFi networks and requires a specific gateway device for alerts, which could complicate setup if your home network is different or if you want a simpler system. Also, while it’s labeled for indoor use, it may not be fully waterproof or rugged enough for very humid or outdoor greenhouse conditions without some protection. This product is well suited for hobbyists or small greenhouse owners who want accurate, remote monitoring and detailed data without complex installation.