San Francisco Weather in July 2026

July in San Francisco confounds first-time visitors expecting California summer. Highs reach just 19.2C (67F) with lows of 13.4C (56F), rainfall stays essentially zero at 1mm, and sunshine logs 12.9 hours despite fog. Mark Twain never actually said the winter quote about San Francisco, but he might as well have — Karl the Fog rolls through the Sunset at 40mph while downtown stays clear, and Ocean Beach registers a full 10 degrees cooler than the Mission any given afternoon.

Locals plan by microclimate: brunch on Valencia in the Mission where it might hit 24C, then a windproof afternoon at Ocean Beach with hoodies. July 4 brings Fisherman's Wharf fireworks over the Bay — famously fog-obscured in nine years out of ten, with locals watching the audio-only barge crackle overhead. The San Francisco Marathon fills the streets the last Sunday, running across the Golden Gate Bridge before Karl arrives. Alcatraz tours sell out weeks ahead and Angel Island ferries stay booked. Dolores Park south slope fills on any Mission-warm day.

Ten-year data shows July fog remaining stubbornly consistent even as background temperatures inch up 0.4C — the cold California Current keeps the coast anchored. Rainfall is negligible and hasn't shifted. 2026 forecasts point to another classic Karl summer with fog burning off inland by mid-afternoon but persisting west of Twin Peaks all day. Ocean temperatures hover at 12C, too cold for swimming without a full wetsuit and hood.

For 2026 travelers, July is peak season with peak pricing despite the fog. Downtown and Fisherman's Wharf hotels run $400-600/night. Book Alcatraz tickets six to eight weeks ahead — they routinely sell out through the month. The Mission neighborhood offers warmer accommodations and better food. Skip Ocean Beach swimming plans and instead ride the Muni through the fog for the classic July 2026 SF experience.