I've been having the same issue....it is like it lost my zip code from its database.....only way I can get it to recover seems to be to go outside, turn on GPS and turn off wireless and then wait...hope they fix it soon.
Yepp, same thing in Germany - weather failed to update already two days ago but was OK when I got my position via GPS. Since Friday afternoon 17hs UTC - network error.
Funny enough, hard to find any notes on Google!