Xfce panel has a lovely weather applet. You can add it by right-clicking on the panel (Panel → Add New Items) and selecting it from the list. A new widget ("No data") should appear at the rightmost part of the panel. It needs to be configured for your location by right-clicking on it and selecting Properties. Afterwards, provided that internet access is available, a single left-click on it produces a very reliable 5-day weather forecast. Neat!