City in California, United States
San Francisco weather by month and the best time to visit
When to go to San Francisco
Sep–Oct is the warmest and sunniest. Jun–Aug is cool and foggy; Nov–Mar is rainy and mild. Wildfire smoke can appear Aug–Nov.
San Francisco weather by month
Average daily high, rainfall and conditions.
- Jan13°100 mm
- Feb14°102 mm
- Mar16°82 mm
- Apr17°42 mm
- May19°18 mm
- Jun22°6 mm
- Jul22°1 mm
- Aug23°1 mm
- Sep24°4 mm
- Oct21°29 mm
- Nov17°62 mm
- Dec14°138 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 13°C56°F | 6°C43°F | 100 mm | 84% | Cool |
| February | 14°C58°F | 7°C45°F | 102 mm | 82% | Cool |
| March | 16°C60°F | 8°C46°F | 82 mm | 82% | Cool |
| April | 17°C62°F | 8°C47°F | 42 mm | 80% | Cool |
| May | 19°C66°F | 10°C49°F | 18 mm | 78% | Pleasant |
| June | 22°C71°F | 11°C52°F | 6 mm | 74% | Pleasant |
| July | 22°C72°F | 12°C54°F | 1 mm | 74% | Pleasant |
| August | 23°C73°F | 12°C54°F | 1 mm | 74% | Pleasant |
| September | 24°C74°F | 12°C54°F | 4 mm | 70% | Pleasant |
| October | 21°C71°F | 11°C52°F | 29 mm | 69% | Pleasant |
| November | 17°C63°F | 8°C47°F | 62 mm | 76% | Cool |
| December | 14°C56°F | 6°C44°F | 138 mm | 82% | Cool |
Best months across United States
| Place | Best months | Warmest month |
|---|---|---|
| New York City | Apr–Jun, Sep–Oct | Jul (26°C) |
| Las Vegas | Mar–May, Oct–Nov | Jul (42°C) |
| Los Angeles | Mar–May, Sep–Nov | Aug (32°C) |
| Orlando | Feb–Apr, Nov | May (31°C) |
| Miami | Nov–Apr | Aug (30°C) |
| San Francisco | Apr–May, Sep–Oct | Sep (24°C) |
| Honolulu | Apr–Jun, Sep–Oct | Sep (28°C) |
| Washington, D.C. | Mar–May, Sep–Oct | Jul (31°C) |
| Chicago | May–Jun, Sep–Oct | Jul (25°C) |
| Boston | May–Jun, Sep–Oct | Jul (28°C) |
| New Orleans | Feb–Apr, Oct–Nov | Jul (30°C) |
| San Diego | Apr–May, Sep–Nov | Aug (32°C) |
| Seattle | Jun–Sep | Aug (24°C) |
| Maui | Apr–May, Sep–Oct | Sep (22°C) |
| Nashville | Apr–May, Sep–Oct | Aug (32°C) |
| Austin | Mar–May, Oct–Nov | Aug (36°C) |
| Miami Beach | Nov–Apr | Aug (30°C) |
| Key West | Dec–Apr | Aug (30°C) |
| Denver | May–Jun, Sep–Oct | Jul (33°C) |
| Philadelphia | Apr–May, Sep–Oct | Jul (30°C) |
| Portland | Jun–Sep | Aug (29°C) |
| Atlanta | Mar–May, Oct–Nov | Jul (32°C) |
| San Antonio | Mar–May, Oct–Nov | Aug (36°C) |
| Charleston | Mar–May, Oct–Nov | Jul (32°C) |
| Savannah | Mar–May, Oct–Nov | Jul (33°C) |
| Fort Lauderdale | Dec–Apr | Aug (30°C) |
| Kauai | Apr–Jun, Sep–Oct | Sep (27°C) |
| Big Island | Apr–Jun, Sep–Oct | Aug (26°C) |
| Sedona | Mar–May, Sep–Nov | Jul (35°C) |
| Scottsdale | Feb–Apr, Oct–Nov | Jul (42°C) |
Quick answers
What is the best month to visit San Francisco?
Apr–May, Sep–Oct. Sep–Oct is the warmest and sunniest. Jun–Aug is cool and foggy; Nov–Mar is rainy and mild. Wildfire smoke can appear Aug–Nov.
When is the rainy season in San Francisco?
Rain peaks in December with about 138 mm. No month averages 150 mm or more.
What is the hottest month in San Francisco?
September, with average highs of 24°C (74°F).
How cold does San Francisco get?
The coolest nights are in January, averaging 6°C (43°F).
More about San Francisco
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Sources
- NASA POWER climatology (2001–2020)
- SFMTA (Muni)
- BART
- San Francisco International Airport
- San Francisco Travel
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.