What you need to know about San Francisco's climate
The most important fact to keep in mind when travelling to San Francisco is that the San Franciscan climatic conditions are very hard to predict. What's more it varies from neighborhood to neighborhood, making it even harder to forecast.
Visitors might find it hard to pack to suit the unpredictable weather which often defies the daily and seasonal forecasts. Even the locals are often baffled. What you can expect to see are San Francisco's trademark fog and brilliant sunsets.
January is the coldest and wettest month and September the warmest.
http://www.sftravel.com/sanfranciscoweather.html
http://www.idcide.com/weather/ca/san-francisco.htm
