Typhoon Weather widget probably the most beautiful, simplistic weather widget for Linux. It displays weather for 7 days, wind speed etc. You can easily select your location by typing it on the location setting. Additionally, you can select from many available colors in the Settings page.
To install Typhoon on Ubuntu 14.04 and all derivatives, simply open Terminal and add the official Typhoon PPA as follows:
sudo add-apt-repository ppa:apandada1/typhoon
sudo apt-get update
sudo apt-get install typhoon