San Francisco, California Weather in September

September weather

September is often San Francisco's warmest month, with afternoons around 24°C and little rain. It's sunnier than the city's foggy reputation suggests, though evenings cool off. You can enjoy outdoor stops like Lands End, Golden Gate Park and the waterfront without summer's chill. Save long beach swims for warmer places: the Pacific stays cold, even on a sunny day.

Events and city days

The Folsom Street Fair brings a large leather and LGBTQ+ crowd to SoMa in September. It's a lively, adult-focused street event, so families may prefer a different route that day. Labor Day also falls in September, though the date changes each year. For hikers, the Lands End Coastal Trail is a good pick: clear spells make the ocean views easier to enjoy, but wind can still bite along the cliffs.

Crowds and local tips

September sits between the busy summer season and the wetter fall months. You'll often find fewer holiday crowds than in July or August, while pleasant weather keeps popular sights lively. Hotel prices can ease after summer, but big events and conferences may push them up. At the Ferry Building, check the bay breeze before choosing an outdoor table; the waterfront can feel much cooler than sunny Mission District streets.