ForecastFox
A couple of days ago I installed ForecastFox. You will no doubt be disappointed to hear that this is not a really attractive weathergirl/boy but is in fact an extension for Firefox. It simply puts the current weather conditions, as well as the following few days forecast, in the right-hand side of your status bar. It’s fully customisable as to location, number of days to show, type of info etc. and is dead handy if you are planning a BBQ.