Flood information service.
GreatWeather is updated fortnightly and featuring nearly 1500 weblinks to UK weather forecasts, charts, rain radar and satellite imagery.
Weather information and severe weather warnings (including historic data).
Use SunCalc to show sun movement and sunlight phases during the given day at the given location.
UK based live weather stations & web cams.
Site has a number of weather stats including climate averages, forecasts and current conditions.
Use Weather Underground to search current and historic weather conditions throughout the country.