In the meantime, the Netatmo Weather Station (version 3) is Homekit-compatible.
https://www.netatmo.com/de-ch...

Nope. If you want integration with Home Kit take a look to the Netatmo Healthy Home Coach https://www.galaxus.ch/en/s1/product/netatmo-healthy-home-coach-home-automation-7512710, which is basically has same functionality as main module of weather station but not supporting additional modules and controlled by separate App