Quick verdict
Peak season: May–Jun, Sep–Oct. Shoulder: Apr, Jul–Aug, Nov. Low: Jan–Mar, Dec.
San Francisco has a mild Mediterranean climate with cool summers and wet winters.
What's the weather like in San Francisco by month?
Each month classified as peak (best balance of weather and value), shoulder (a step in either direction), or low season.
Why visit San Francisco during May–Jun, Sep–Oct?
Warming gradually with occasional rain early on. April and May bring the clearest skies.
Shoulder season (Apr, Jul–Aug, Nov) trades a small weather concession for noticeably smaller crowds and softer prices — often the sweet spot for travelers who want flexibility.
Low season (Jan–Mar, Dec) is when prices fall hardest. Expect weather extremes (heat, humidity, cold, or rain depending on the destination) and reduced hours at some seasonal businesses, but the trade-off can be worth it if budget or solitude matters more than perfect conditions.
What festivals and events happen in San Francisco?
- SF Pride ParadeJune
One of the largest and oldest LGBTQ+ pride celebrations in the world, with a massive parade down Market Street and events across the city.
- Outside Lands Music FestivalAugust
A major music festival in Golden Gate Park featuring top artists, local food vendors, wine lands, and art installations over three days.
- Fleet WeekOctober
A week of ship tours, air shows featuring the Blue Angels flying over the bay, and military displays along the waterfront.
- Chinese New Year ParadeJanuary-February
The largest Chinese New Year celebration outside of Asia, with a massive evening parade through Chinatown featuring a 268-foot Golden Dragon.
Cooler & warmer in North America this May
If San Francisco's May weather isn't your match, here are the closest North America alternatives at different temperatures. Distances are from San Francisco.
Cooler
See the full ranked list: All North America destinations in May →
Frequently asked
When is the best time to visit San Francisco?
The best time to visit San Francisco is May–Jun, Sep–Oct. San Francisco has a mild Mediterranean climate with cool summers and wet winters. These months balance comfortable weather, manageable crowds, and prices that haven't yet hit peak-season highs.
When is the cheapest time to visit San Francisco?
Low-season months in San Francisco run Jan–Mar, Dec. Flights and hotels typically run 20-40% cheaper than peak. The trade-off is weather (which is why these months are off-peak) and some businesses operating shorter hours, especially in smaller seasonal destinations.
What's the weather like in San Francisco year-round?
Summer averages around 22°C (72°F) and winter averages around 10°C (50°F) in San Francisco. San Francisco has a mild Mediterranean climate with cool summers and wet winters. The city is famous for its summer fog — Mark Twain may not have actually said it, but the coldest winter really can feel like a San Francisco summer. Microclimates vary dramatically between neighborhoods.
What festivals or events are happening in San Francisco?
Notable events in San Francisco: SF Pride Parade (June); Outside Lands Music Festival (August); Fleet Week (October). One of the largest and oldest LGBTQ+ pride celebrations in the world, with a massive parade down Market Street and events across the city.
How many days do I need in San Francisco?
Most travelers spend 3-5 days in San Francisco, which covers the main neighborhoods, top attractions, and a half-day day trip. Add a day if you're visiting during peak season when crowds slow you down, or if you're combining San Francisco with nearby destinations.
More peak-season picks for San Francisco's best months
See every destination at its peak in each of San Francisco's best months.
Full guide
San Francisco travel guide →
Cost, food, neighborhoods, transit, and hand-picked things to do.
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