Finnish Metereological Institute Weather Forecast Conky
Global weather In English, Finnish or Swedish from the Finnish Metereological Institute
You can put the forecast on your desktop via
conky, where it is updated periodically, or bind it to a hotkey to see it in its own window. You can even use the script separately to produce plain text output to be used elsewhere.
Options can be customized through config files: how far into the future the forecast extends, if you want to see current observations or not, colors, fonts, icons, backgrounds etc.
Make sure to read the Readme's.