San Francisco is a major city in California, the centerpiece of the Bay Area, well-known for its liberal community, hilly terrain, Victorian architecture, scenic beauty, summer fog, and great ethnic and cultural diversity. These are only a few of the aspects of the city that make San Francisco one of the most visited cities in the world.
San Francisco has a mild climate, with cool, wet winters and dry summers. In most months, you can expect the high temperature to be in the upper 50s, 60s or low 70s degrees Fahrenheit (between 15 and 25 degrees Celsius). However, these mild temperature readings belie a unique climate not shared by other major cities in the state or country.
Summer days usually start out under fog, slowly burning off towards the ocean into a sunny albeit windy afternoon. Measureable precipitation during the summer months is rare, although light drizzle is possible. Humidity is very constant, but rarely uncomfortable. At late afternoon, when the fog and wind returns people generally find themselves needing a jacket (and this is summer!). There are some days when the fog lingers all day.
In the winter, the rainy season is in full swing. That being said, the chances for a calm, windless, sunny day are actually higher in the winter than in the summer! However, the overall temperatures are going to be lower in the winter.
Spring and fall are not so much seasons in themselves in San Francisco, but rather they are quick transitional periods with some days resembling summer and others the winter. Fall in particular is a good time to visit because the summer wind & fog has mostly gone, but the rainy season has not yet started. The late summer month of September, as summer transitions into fall, is the warmest and driest month of the entire year for San Francisco. Heat waves can occasionally occur around this time of year.
Perhaps the most recognizable landmark in San Francisco and one of the most famous bridges in the world, the Golden Gate Bridge, spanning the Golden Gate, has been called one of the Seven Wonders of the Modern World and is the first thing you see of San Francisco if driving in from the north, as it is one of the major road routes into and out of the city. Overlooking the Golden Gate is the Presidio, a former military post with beautiful architecture and a very scenic park setting. Within the Presidio is the gorgeous Palace of Fine Arts, built for the 1915 Panama-Pacific Exposition and reminiscent of Roman and Greek architecture.