It depends on when you go, but my daughter lives just over the Golden Gate Bridge, so here's what I have found to be the general. It starts out foggy in the morning, but by ten am I can look out from her balcony and see San Fran across the bay. Usually the temp hods between 62 to 72. It can be cool in the evening, so if you are going to the Wharf in the evening, take a coat. I always take jeans and sweaters, and wear layers.