Everyone can forget (at least - for now) about Weather in FSD.
Yes, there is an updated unofficial rev.783 that supports APIv2, but WorldWeatherOnline stopped providing free keys and starts providing 2-months trial premium keys.
The algorithm is different and premium does not work as free ones.
So if you have old free key - you can use it at least till they will be obsolete at all.
If you haven't - forget about the weather.