I'm just about to build my own external temperature and humidity sensor, using a Sensiron SHT45 sensor with integrated PTFE filter.
I've had Tuya and Aqara sensors outside, undercover and out of direct rain for the past 3 years, and every one lasts about a year before the humidity sensor gets stuck at the maximum reading. Even bringing it indoors doesn't get it working again. I'm hoping the built-in heater on the SHT45 will help when we're sat in sea mist or sea fog and keep the sensor working for longer.
I've had Tuya and Aqara sensors outside, undercover and out of direct rain for the past 3 years, and every one lasts about a year before the humidity sensor gets stuck at the maximum reading. Even bringing it indoors doesn't get it working again. I'm hoping the built-in heater on the SHT45 will help when we're sat in sea mist or sea fog and keep the sensor working for longer.