Ananova: London

Detailed daily forecast and five-day outlook.

http://www.ananova.com/weather/location.html?menu=weather.yourarea&location=London

BBC Online : London Webcams

Realtime weather. One sited looking up the river Thames. Another at Television
Centre, looking out over west London.

http://www.bbc.co.uk/england/webcams/regions/london/london_webcam_index.shtml

BBC Weather Centre - South East England

By area and city/town.

http://www.bbc.co.uk/weather/ukweather/southeast/index.shtml

Intellicast.com: London Forecast

Predictions for ten days ahead.

http://www.intellicast.com/Local/IntlLocalStd.asp?loc=egll&seg=LocalWeather&prodgrp=Forecast&product=Forecast&prodnav=none&pid=none

Met Office: South East

Weather forecast by area and city/town.

http://www.meto.gov.uk/weather/europe/uk/southeast.html

Weather in London

3 and 10 days weather forecasts. Site informers. Archive. Html and Wap versions.
Links for other European cities.

http://www.london-weather.info/