http://www.bbc.co.uk/weather/world/
The BBC weather website gives you a weather forecast, anywhere in the world that you are going!
http://www.metoffice.gov.uk/weather/
The Met Office is one of the world's leading providers of environmental and weather-related services.  For all your UK, European and world weather forecasts!
http://www.weatheronline.co.uk/
Weather Online gives weather reports, forecasts and average temperatures of places all over the world.