GNOME Shell Weather Extension by Neroth is a fork of the original GNOME Shell Weather Extension, which compared to the original, comes with multiple locations support, you don't have to manually enter a WOEID and bug fixes (the weather information seems to load a lot faster with this extension). It displays the current weather conditions along with a forecast for today and tomorrow on the top GNOME Shell panel.
The extension lets you easily search for a city within its settings, so you don't have to enter any WOEID from weather.yahoo.com like in the original version. From its settings, you can also configure the temperature unit, wind speed unit, position on the panel, enable/disable: symbolic icons, show temperature on the panel and conditions on the panel.
This Weather Extension only availble for Ubuntu 12.10/12.04/11.10 and tested on Ubuntu 12.04 with gnome shell 3.4
Installation of Weather Extension, Enter following commands in Terminal:
When installation done Press Alt+F2 and type "r" to restart shell
sudo add-apt-repository ppa:gnome-shell-extensions sudo apt-get update sudo apt-get install gnome-shell-extension-weather