Hi! I’m building sauna automations and need to measure the temperature in the sauna. I’ve been struggling to find a good sensor that would withstand high humidity/steam and temperatures up to 100C. Wifi, zigbee or z-wave are all acceptable. The price range could be ca. €20-30 and it should be available in Europe. I’d appreciate any hints and suggestions to find the right sensor for my sauna. Thanks upfront!
If you’re up for a bit of DIY and using ESPHOME you could use a ds18b20 temp sensor and a NODEMCU or ESP32
Or you could go SONOFF:
I use the ds18b20 for monitoring my fish tank temp.
It’s not high temp but it is pretty wet in the water 
so it should be able to handle high humidity ok.
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My AM2302 (DHT22 look alike) is working fine, although I must admit that we’re not using the sauna very frequently.
The Wemos Mini running ESPHome is of course outside the sauna.
I can recommend RuuviTag BLE devices based on my experience. I have several of them and they are handy with or without HA.
While RuuviTag can operate at those temperatures the standard CR2450 battery might not. Pick a wide temperature range battery if you find it somewhere https://ruuvi.com/products/cr2477t-battery/. I suppose the battery is limitation in any other sensors and batteries as well.
BLE monitor integration can be used with RuuviTags https://github.com/custom-components/ble_monitor
Thanks for the suggestions! Although DIY-capable, I am trying to save time and prefer plug’n’play options right now. I will look into RuuviTag (that price tag, though) and Sonoff options. Sonoff might be a good balance between cost and functionality. Thanks!