UK weather forecast - Met Office
Met Office 5-day weather forecast for UK, 15-day and 30-day forecast for the UK.
http://www.metoffice.gov.uk/weather/uk/uk_forecast_weather.html
Weather and climate change - Met Office
Met Office weather and climate change forecasts for the UK and worldwide. World leading weather services for the public, business, and government.
http://www.metoffice.gov.uk/