I have recently added Aeotec’s aërQ Temperature & Humidity Sensor to my smart home network and it has been working very well. It’s a Z-Wave sensor, and requires a custom DTH, which can be found here.
If you prefer ZigBee, then maybe take a look at the Aqara Temperature and Humidity Sensor. This sensor also requires a custom DTH, which can be found here. The community thread for the Aqara sensor is here: Xiaomi Aqara temperature/humidity sensors. Do I need a gateway?