San Jose's smaller and less populous neighbor to the north, San Francisco, is referred to by area residents as simply "The City". Truly one of the grandest cities in the world, San Francisco is the centerpiece of the Bay Area in many ways. Cosmopolitan and eclectic at the same time. World class in all respects. San Francisco Map
What's there to see and do? How's this:
Since the Bay Area is semi-arid, it seldom rains between May and October. Conversely, our rainy season usually starts in October and ends the following May. So it's pretty green in the mountains during the winter, but golden brown during the summer months.
During most summer days there isn't a cloud in the sky. Temperatures can reach into the high 90's, but humidity is low and it is usually very comfortable. During the summer, the cool ocean breezes roll into the Bay Area every afternoon and fog rolls into San Francisco. So even though it may be very hot during the day, the entire Bay Area cools down in the evening.
Because it is located on the tip of a peninsula, San Francisco has it's own unique micro-climate that can be considerable different than other areas around the Bay. Mark Twain once said he never suffered a colder winter than an August in San Francisco. Make sure you include warm clothing or you'll end up buying a sweatshirt at one of the tourist stops. The fog doesn't burn off until late in the morning and it can be pretty cold and windy.
Here are some websites to help you with your planning: