San Francisco in September: What to Expect

September is arguably the best month to visit San Francisco. The city's famous summer fog, which blankets the coast and the Golden Gate Bridge through June and July, retreats in September for what locals call Indian summer. The result is warm, clear, genuinely sunny San Francisco, which is a different city from the foggy version most visitors experience.

Weather

September in San Francisco runs between 14 and 22°C, which is notably warmer and sunnier than summer. The marine layer that creates June Gloom has mostly lifted, meaning the Golden Gate Bridge is visible and the bay is clear. This is when the city's outdoor culture, the parks, the waterfront, the weekend farmers markets, hits its stride. Evenings can still be cool: pack a layer. The neighbourhoods away from the water, including the Mission and Noe Valley, run warmer than the Sunset District.

Crowds and Prices

San Francisco's tourism peaks in summer despite the fog, and September brings a modest drop in visitor numbers. Hotel prices in Union Square and Fisherman's Wharf drop from August rates. The popular sites, including Alcatraz, Lombard Street, and the cable cars, are busy year-round but September is more manageable than the height of summer.

What's On

Hardly Strictly Bluegrass, the free Golden Gate Park music festival, runs in late September or early October and is one of the city's best annual events. It draws hundreds of thousands of people over a weekend and is worth timing a trip around. Fleet Week San Francisco, with its Blue Angels air display over the bay, typically runs in early October but the preparations and related events begin in September. The San Francisco Marathon was in July, but the city's running and cycling culture is active year-round.

One Thing to Watch

Alcatraz booking is the most common mistake San Francisco visitors make. Tickets sell out two to four weeks in advance, sometimes more. Book before you book your flights, not after you arrive. The evening and night tours sell out even further in advance. If you land in San Francisco without an Alcatraz ticket, your chance of getting one as a walk-up is very low.