If only there's a $PS1 version
That would be cool, but how would you condense the information enough that it's both useful and doesn't take up 2/3 of a line?
Emojis? For the current weather, a single emoji could convey quite a lot; e.g. a snowflake for sub-60 weather (I have a low tolerance for cold), a sun for 60-80, fire emoji for 80+...
Now, I don't know if anyone truly needs the weather in their terminal prompt, but it is doable.
curl 'wttr.in/?format=%c'
see the readme here for all options: