September is when San Francisco gets its summer. The fog usually eases, average highs reach about 70°F and the beaches and parks fill up on clear afternoons. Summer crowds thin after Labor Day, which makes it one of the best months to visit.
In this guide
This page is part of our San Francisco events calendar.
September 2027 at a glance
- Sep 5 Free First Sunday at the Asian Art Museum
- Sep 6 Labor Day
- Sep 7 Free First Tuesday at the de Young and Legion of Honor
- September Opera in the Park, usually in Golden Gate Park
- Sep 26 Folsom Street Fair, SoMa, 11am to 6pm
- Weather Average high 70°F, low 56°F, very little rain
Warm weather days
September’s warm, clear days are good for Baker Beach, Crissy Field, Dolores Park and a walk across the Golden Gate Bridge. Ghirardelli Square and Aquatic Park are pleasant on calm evenings. See outdoor activities in San Francisco and the best views.
Opera in the Park
San Francisco Opera usually opens its fall season with a free Opera in the Park concert in Golden Gate Park in September. The 2026 concert was cancelled, so check the San Francisco Opera website for 2027 plans.
Folsom Street Fair, September 26
The Folsom Street Fair is a large leather and kink street fair in SoMa, held on Sunday, September 26, 2027, from 11am to 6pm. It is an adult event and is not suitable for children. Streets in the area close for the day.
Labor Day weekend
Labor Day is Monday, September 6. It is a busy weekend at Fisherman’s Wharf and on the bridge, so book tours early. The Fisherman’s Wharf guide has tips.
Coming up in October
Hardly Strictly Bluegrass and Fleet Week usually fall in early to mid October. See San Francisco events in October.
Official resources: San Francisco Opera, Folsom Street Fair.
Frequently asked questions
What is the warmest month in San Francisco?
September, with average highs near 70°F. October is close behind.
When is the Folsom Street Fair 2027?
Sunday, September 26, 2027, from 11am to 6pm in SoMa. It is an adults-only event.
Is Opera in the Park free?
Yes, it is a free concert. Check San Francisco Opera for the 2027 date.
Photo credits
Featured image: The wub / Wikimedia Commons, CC BY-SA 4.0.