If you ever decide to visit my city in the summer, be prepared for foul weather once the sun goes down.
This pic is at one of the higher spots in the city, near twin peaks. So it does get extra foggy compared to some of the lower points (downtown, embarcadero, etc)
If you have an iphone, check out an app called SFClimates to stay on top of all of the microclimates.
Weird, I know.
