San Francisco is an unusual and unpredictable place. I'm not just talking about earthquakes, but the colourful character of the city itself. For example, its weather does not conform to the four seasons. The city will often be overcast and cool in the summer with morning fog, but by contrast the fall (autumn) period is normally sunny or blisteringly hot with mild clear nights (learn more). However, don't assume that you can predict the local weather with forecasting; on the day I was there the famous fog was blowing in the opposite direction to usual for that time of year, a phenomenon which our tour guide kept commenting about that he had never seen it before.
Suffice to say my one day in the city was jam-packed and a lot of fun. Basically dawn to dusk with around 5 hours' total travel to get there and back. I took in as much as I could and the best review is the picture gallery I posted. I wrote there that the sea lions are a good metaphor for the way the city embraces those whom others reject, and this is definitely a hallmark. SF, it was a brief introduction but God has incredible dreams and purposes for you.