We don't care about a Weather app. Very easy to do and there are millions of it. What is missing is good freely accessible data /api for weather info.

Most free one are disappearing and frustratingly in most countries, the weather agency you pay with your tax will not provide it for you.

I care about a weather app and since Dark Sky disappeared there has been nothing even remotely close to it in usefulness, FOSS or otherwise.

Weather agencies funded by taxes should make their data available to everyone, since it’s the public that finances them. Luckily, that’s already the case where I live, but when I travel I have to rely on global sources like Open-Meteo, which are usually less accurate than local ones. Another open (and global) alternative would be great.