Météo France

Météo-France publishes no documentation for its API, but the one behind its mobile app is open and needs no account, the very same one used by Home Assistant's official Météo-France integration. This app draws a live reading, forecasts, rain within the hour and weather alerts from it. One device per town: real temperature and feels-like, wind, pressure, cloud cover, today's and tomorrow's forecast, rain within the hour, rain and frost probabilities. One device per department: the alert level for each of the nine tracked phenomena (wind, thunderstorms, heat wave, flood, snow/ice...) and the worst overall level.