If you want to make your own system for doing so, Instructables user ICStation shows off how to use an Arduino to do it. The system here monitors temperature, humidity, and smoke levels and alerts ...

The design of [dzzie]’s smart humidor consists of an Arduino, WiFi shield, LCD + button shield, and most importantly, a DHT22 temperature and humidity sensor. In a bit of thoughtfulness ...

The Anavi Thermometer Development board is fully compatible with the Arduino IDE ... with a built-in DHT22/AM2302 temperature and humidity sensor and has slots for a mini OLED display, waterproof ...