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 ...

Monitor temperature, humidity, and air pressure in every room with the Aqara Temperature Sensor. Optimize comfort, prevent damage, and automate your HomeKit smart home.

Note: Aqara provided MacRumors with a Wireless Remote Switch H1, Smart Wall Switch H1, Temperature and Humidity Sensor, and ‌M2‌ Hub for the purpose of this review.