Quick answer: The best time to visit San Francisco is September and October: the warmest, sunniest weather of the year with less fog. Summer (June–August) is busy and often cool and foggy. Winter is mild, rainier and cheapest.
San Francisco weather by month
| Month | Average high | Notes |
|---|---|---|
| January | 14°C | Rainiest, low prices |
| February | 16°C | Rain, Chinese New Year parade |
| March | 17°C | Green hills |
| April | 18°C | Pleasant, fewer crowds |
| May | 19°C | Fog starts |
| June | 20°C | Pride (late June), fog |
| July | 20°C | Peak crowds, foggy, cool |
| August | 21°C | Foggy mornings |
| September | 22°C | Warmest, sunniest |
| October | 21°C | Excellent; Fleet Week |
| November | 18°C | Mild, quieter |
| December | 14°C | Holiday lights, rain |
Why summer is cold
Inland heat pulls cool ocean air through the Golden Gate, creating the famous fog (nicknamed Karl). The west side and the bridge are often grey while the Mission is sunny.
Compare hotel prices in San FranciscoCheapest time to visit
January to March, outside big conferences. Hotel prices spike when major tech events are in town, so check before booking.
Search cheap flights to San FranciscoWhat to pack
- Layers and a windproof jacket, whatever the month.
- Comfortable shoes for steep hills.
- A rain jacket from November to March.
FAQ: best time to visit San Francisco
What is the warmest month in San Francisco?
September, closely followed by October.
Is it worth visiting San Francisco in summer?
Yes, just pack warm layers and expect fog, especially near the coast and the bridge.
More San Francisco guides
- San Francisco travel guide
- 25 best things to do in San Francisco
- San Francisco itinerary: 2, 3 or 4 days
- Where to stay in San Francisco
- SFO airport to the city
- Alcatraz tickets
- Golden Gate Bridge guide
- San Francisco cable cars
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