AccuWeather.com
Includes 15 day weather forecasts, wind chill or heat index, and the National Weather Service forecast for the surrounding area.
Bay Area Weather
From Bayinsider.com, updated five-day forecasts for SF and the Bay Area with Doppler radar photos
FogWatch.com
Provides news and information on fog conditions in western San Francisco.
MaximumWeather - Forecast for San Francisco, Calif
Offers a weather forecast for city with current conditions and four day outlook.
The Weather Channel - San Francisco, CA
Local weather, forecasts and satellite maps.
Weather Underground: San Francisco Forecast
Includes detailed forecasts, satellite imagery, marine forecast, weather advisories.
WxUSA - San Francisco
Links to current conditions, forecasts, radar, maps, hurricane, weather cams, and kid's weather.