USA
Best time to visit San Francisco
Based on 12 years of real historical weather data (2015–2026). Sunshine hours, rainfall, and temperature — week by week.
Planning a trip, an event, or a party in San Francisco? Here's what to expect. Summers here run warm, and winters are cooler. For the best odds of good weather, aim for September, August and June. Days run warm, with up to 11.4h of sunshine and very dry.
Month-by-month weather
San Francisco in January runs cool, averaging 13.8°C.
San Francisco in February runs cool, averaging 14.8°C.
San Francisco in March runs mild, averaging 15.9°C.
San Francisco in April runs mild, averaging 16.2°C.
San Francisco in May runs mild, averaging 17.4°C.
San Francisco in June runs mild, averaging 19.1°C.
San Francisco in July runs mild, averaging 19°C.
San Francisco in August runs warm, averaging 20.1°C.
San Francisco in September runs warm, averaging 21.1°C.
San Francisco in October runs warm, averaging 20.4°C.
San Francisco in November runs mild, averaging 16°C.
San Francisco in December runs cool, averaging 13.4°C.
Frequently asked questions
What is the best time to visit San Francisco?
If you're planning a trip, wedding, or outdoor event in San Francisco, aim for September, August and June — Days run warm, with up to 11.4h of sunshine and very dry. This is based on 12 years of real historical weather data (2015–2026), not a single forecast.
What is the weather like in San Francisco in September?
If you visit San Francisco in September, expect warm days around 21.1°C You'll get around 11.4h of sunshine per day and 0.1mm of rain — very dry.
What is the hottest month in San Francisco?
September is typically the hottest month, running warm — good to know if you're planning something outdoors and want to avoid the peak heat.
What is the driest month in San Francisco?
June is your safest bet if you want to avoid rain, averaging only 0mm per day. December is the wettest, at 4.4mm per day — worth planning around if you're hosting anything outdoors.
All weeks ranked by weather score
| Week | Dates | Midday temp | Range | Sun / day | Rain / day | Score |
|---|---|---|---|---|---|---|
| W36 | Sep 2–8 | 21.0°C | 13.7° → 26.6° | 11.6h | 0.0mm | 94 |
| W39 | Sep 23–29 | 21.7°C | 12.5° → 28.2° | 11.2h | 0.1mm | 94 |
| W40 | Sep 30–Oct 6 | 22.0°C | 11.9° → 26.8° | 10.4h | 0.5mm | 94 |
| W35 | Aug 26–Sep 1 | 21.0°C | 13.6° → 24.9° | 12.0h | 0.0mm | 93 |
| W37 | Sep 9–15 | 21.1°C | 13.4° → 25° | 11.3h | 0.1mm | 93 |
| W38 | Sep 16–22 | 20.6°C | 12.9° → 24.7° | 11.3h | 0.2mm | 93 |
| W34 | Aug 19–25 | 20.5°C | 13.5° → 24.6° | 12.2h | 0.0mm | 92 |
| W33 | Aug 12–18 | 20.3°C | 13.4° → 24° | 12.2h | 0.0mm | 91 |
| W24 | Jun 10–16 | 19.7°C | 11.8° → 24° | 13.4h | 0.0mm | 90 |
| W28 | Jul 8–14 | 19.2°C | 12.7° → 21.8° | 13.2h | 0.0mm | 90 |
| W29 | Jul 15–21 | 19.3°C | 12.7° → 22.1° | 13.1h | 0.1mm | 90 |
| W32 | Aug 5–11 | 19.5°C | 13.3° → 22° | 12.6h | 0.0mm | 90 |
| W41 | Oct 7–13 | 20.3°C | 11.8° → 24.8° | 10.0h | 0.5mm | 90 |
| W25 | Jun 17–23 | 19.1°C | 11.9° → 22.6° | 13.5h | 0.0mm | 89 |
| W27 | Jul 1–7 | 19.1°C | 12.2° → 22.3° | 13.3h | 0.0mm | 89 |
| W31 | Jul 29–Aug 4 | 19.3°C | 12.7° → 22.4° | 12.4h | 0.0mm | 89 |
| W23 | Jun 3–9 | 18.8°C | 11.3° → 23.5° | 13.0h | 0.0mm | 88 |
| W26 | Jun 24–30 | 18.6°C | 12° → 21.3° | 13.3h | 0.0mm | 88 |
| W30 | Jul 22–28 | 18.6°C | 12.8° → 20.7° | 12.5h | 0.0mm | 88 |
| W22 | May 27–Jun 2 | 18.3°C | 10.9° → 21.5° | 13.1h | 0.1mm | 87 |
| W43 | Oct 21–27 | 19.7°C | 11.3° → 23.6° | 9.0h | 0.9mm | 86 |
| W19 | May 6–12 | 17.2°C | 10° → 21.1° | 13.1h | 0.2mm | 85 |
| W21 | May 20–26 | 17.3°C | 10.7° → 20.2° | 13.0h | 0.2mm | 85 |
| W44 | Oct 28–Nov 3 | 19.1°C | 9.8° → 21.7° | 8.9h | 0.5mm | 85 |
| W16 | Apr 15–21 | 16.5°C | 8.9° → 20.3° | 11.7h | 0.9mm | 83 |
| W18 | Apr 29–May 5 | 17.0°C | 9.8° → 20° | 12.3h | 0.8mm | 83 |
| W42 | Oct 14–20 | 20.7°C | 11.4° → 26.6° | 9.5h | 2.3mm | 83 |
| W17 | Apr 22–28 | 16.4°C | 9.3° → 19.2° | 12.1h | 0.9mm | 82 |
| W20 | May 13–19 | 17.2°C | 10.3° → 20.1° | 12.5h | 1.0mm | 82 |
| W13 | Mar 25–31 | 16.7°C | 8° → 19.8° | 11.0h | 1.4mm | 81 |
| W45 | Nov 4–10 | 17.6°C | 9.2° → 20° | 9.2h | 1.3mm | 81 |
| W15 | Apr 8–14 | 15.6°C | 8.1° → 18.9° | 10.8h | 1.8mm | 77 |
| W14 | Apr 1–7 | 16.2°C | 7.8° → 20.1° | 10.2h | 2.1mm | 76 |
| W11 | Mar 11–17 | 15.9°C | 7.4° → 19.5° | 9.5h | 2.5mm | 73 |
| W12 | Mar 18–24 | 16.0°C | 7.9° → 18.7° | 10.0h | 2.8mm | 73 |
| W4 | Jan 22–28 | 14.1°C | 5.9° → 16.5° | 8.0h | 1.5mm | 70 |
| W8 | Feb 19–25 | 14.2°C | 5.9° → 17.5° | 9.5h | 2.3mm | 70 |
| W46 | Nov 11–17 | 16.3°C | 7.9° → 18.8° | 7.8h | 2.4mm | 69 |
| W47 | Nov 18–24 | 16.1°C | 7.7° → 18.2° | 8.2h | 3.3mm | 66 |
| W6 | Feb 5–11 | 15.4°C | 6.4° → 17.3° | 8.2h | 3.2mm | 65 |
| W9 | Feb 26–Mar 3 | 14.6°C | 6.7° → 17.6° | 8.6h | 3.2mm | 64 |
| W10 | Mar 4–10 | 15.1°C | 6.9° → 18° | 8.6h | 3.5mm | 64 |
| W48 | Nov 25–Dec 1 | 13.9°C | 6.1° → 15.9° | 7.9h | 2.6mm | 64 |
| W5 | Jan 29–Feb 4 | 14.9°C | 5.9° → 17.3° | 7.8h | 3.4mm | 62 |
| W49 | Dec 2–8 | 14.1°C | 6.3° → 16.2° | 7.0h | 2.9mm | 60 |
| W7 | Feb 12–18 | 14.8°C | 6.6° → 17.3° | 8.4h | 4.3mm | 58 |
| W3 | Jan 15–21 | 13.9°C | 6.2° → 16.2° | 7.3h | 4.2mm | 54 |
| W51 | Dec 16–22 | 13.2°C | 5° → 15.1° | 6.4h | 3.6mm | 54 |
| W2 | Jan 8–14 | 14.0°C | 6.5° → 15.7° | 6.7h | 4.3mm | 53 |
| W50 | Dec 9–15 | 13.5°C | 5.7° → 15.7° | 7.0h | 4.3mm | 53 |
| W1 | Jan 1–7 | 13.1°C | 5.3° → 14.8° | 6.2h | 5.6mm | 45 |
| W52 | Dec 23–29 | 13.0°C | 4.9° → 14.7° | 6.1h | 6.7mm | 42 |
Nail down the right dates for San Francisco
Compare individual weeks, see year-by-year variation, and download the data as Excel — everything you need to plan a trip, wedding, or event.
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