10 Best Smart Thermometer For Greenhouse 2026 in the United States

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.

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 Bluetooth Hygrometer Thermometer is a solid choice for monitoring temperature and humidity in environments like greenhouses. It features a Swiss-made sensor that delivers accurate temperature readings within ±0.54°F and humidity within ±3% RH, which should be precise enough for most plant care needs. You can easily connect it to your phone via Bluetooth with a range of up to 196 feet, allowing you to receive alerts if conditions go outside your preset comfort zones—helpful for preventing plant stress in your greenhouse. The device's large 3-inch LCD screen shows current readings along with high and low records, so you can quickly check conditions without needing your phone.

It also offers useful data logging, storing up to 20 days of records online and allowing you to export up to 2 years of data in CSV format for detailed tracking over time. Powered by 4 included AAA batteries, it should run for a good while without needing frequent replacements. The temperature range tops out at 140°F, which is more than enough for typical greenhouse conditions but might be limiting for more extreme environments. Also, connectivity is limited to Bluetooth, so it doesn’t support Wi-Fi for remote monitoring beyond Bluetooth range.

This product suits hobbyists or small-scale greenhouse owners who want reliable, accurate data and easy alerts without complicated setup. For users needing constant remote access or integration with other smart home systems, devices with Wi-Fi connectivity might be preferable. However, for straightforward temperature and humidity tracking with helpful data history, the Govee Thermometer is a practical and user-friendly option.