Comment 31 for bug 776586

I managed to solve it, partially - could show it in English only.

To show the forecast, first you need ROOT permission to /usr/bin/
Than, close the weather indicator
Open /usr/bin/indicator-weather.py with the text editor (it's called gedit) and perform a search for the text "hl" (without the double quotation marks). You should make every "hl" search result into "hl = 'en'" (without the double quotation marks - you should keep the single ones around the word en).

Hope it helps!
And I really tried to explain it even to beginners.

P.S: Sorry about any grammar mistake.