January vs October

Strong option

Cheapest hotels of the year, nearly tourist-free — but January rain is no myth.

• ↑Hotel rates in January drop 40–50% below peak summer levels — a mid-range Union Square property that costs $350 in July can be found for under $200 in January. The city's most popular attractions, including Alcatraz tours, are bookable on a few days' notice rather than weeks. Museums like SFMOMA and the de Young operate at a fraction of summer capacity, making the collections feel genuinely accessible.
• ↑The restaurant scene is fully operational and staffed for locals rather than tourists. Legendary spots like Zuni Café, State Bird Provisions, and the Ferry Building Marketplace are easier to get into; reservations that require month-long lead times in the summer open up within days. San Francisco's food culture is year-round — rain has no effect on the city's culinary ambition.

Best match

Warmest weather, two great free festivals, Fleet Week air show — October is the answer.

• ↑October brings Fleet Week (typically the second weekend), when the US Navy's Blue Angels fly formation demonstrations over the bay that are visible from virtually every north-facing vantage point in the city. The show is free to watch from Crissy Field, Fort Mason, Marina Green, and dozens of rooftops and hills. It's one of the few genuinely world-class free spectacles available in any major city — an F/A-18 in full afterburner over the Golden Gate Bridge is difficult to forget.
• ↑Hardly Strictly Bluegrass (first weekend of October, Golden Gate Park) is the other great October event — a free, three-day, multi-stage music festival that draws 750,000 people over the weekend. The late Warren Hellman's gift to the city is fully funded in perpetuity: no ticket required, no commercial sponsorship wall, just an extraordinary lineup (Steve Earle, Emmylou Harris, Hazel Miller) spread across six stages in the park. It remains one of the world's great music events that most people outside the Bay Area have never heard of.