Yahoo weather has changed the layout slightly, so the 5 day forecast wasn't showing anymore. I tried to download the latest version of the MS Weather module, but somehow I got blocked by Nuke Sentinel 2.0.2 . I decided to try to fix the problem myself, and it was easy:
The Yahoo-people have changed the layout slightly, so you'll have to edit class.msweather.php a little. Find the line that says
and change this into
<!-- END FORECAST -->
Mind the spaces !