Weather: San Francisco — September
The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.
🌟 Climate Overview
September is an excellent time to visit San Francisco. Warm weather with highs of 25°C—great for outdoor activities. Rainfall is rare, so you can leave the umbrella at home. Temperatures vary significantly between day and night—layering is recommended. As peak season, expect higher prices and more tourists. At 17°C, the sea is too cold for most swimmers.
Based on weather comfort, crowds, prices, and activity options
25°C
15°C
0days
12.5h
3mm
11.2h/day
73%
Humid8.1
Very High15 km/h (gusts 35)
17°C ❄️ Cold
Is September a good time to visit San Francisco?
The weather is near-perfect with ideal temperatures and minimal rain.
Now
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Air Quality
Travel Context
- CrowdsVery Busy
- Travel Costs Peak Rates
Daylight
06:52
19:21
Visiting San Francisco in September: Pros & Cons
Pros
- Comfortable temperatures for sightseeing
- Minimal rainfall — great for outdoor plans
- Abundant sunshine for beach and outdoor fun
- One of the best months to visit
Cons
- Peak season — expect crowds and higher prices
- Sea too cold for comfortable swimming
- Very high UV — sunscreen and shade essential
Things to Do in September
Recommended for This Weather
San Francisco Weather by Month
| Month | Avg High | Avg Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition |
|---|---|---|---|---|---|---|---|---|
| Jan | 15°C | 7°C | 7d (71mm) | 7.2h | 78% Humid | 3.5 Moderate | | Good |
| Feb | 17°C | 7°C | 6d (59mm) | 8.5h | 72% Humid | 5.2 High | | Good |
| Mar | 17°C | 8°C | 10d (76mm) | 9.7h | 72% Humid | 6.7 High | | Good |
| Apr | 19°C | 9°C | 3d (17mm) | 11.4h | 70% Humid | 9.3 Very High | | Good |
| May | 22°C | 11°C | 2d (11mm) | 12.8h | 68% Humid | 10.8 Extreme | | Good |
| Jun | 23°C | 13°C | 0d (0mm) | 13.4h | 69% Humid | 11.4 Extreme | | Good |
| Jul | 23°C | 14°C | 0d (0mm) | 13.1h | 73% Humid | 11 Extreme | | Good |
| Aug | 25°C | 15°C | 0d (1mm) | 12.4h | 73% Humid | 9.9 Very High | | Good |
| Sep Current | 25°C | 15°C | 0d (3mm) | 11.2h | 73% Humid | 8.1 Very High | | Excellent |
| Oct | 24°C | 12°C | 2d (23mm) | 9.5h | 69% Humid | 6 High | | Excellent |
| Nov | 18°C | 9°C | 6d (44mm) | 8.1h | 73% Humid | 4.1 Moderate | | Good |
| Dec | 14°C | 7°C | 11d (109mm) | 6.5h | 82% Very Humid | 3 Moderate | | Good |
San Francisco
San Francisco: walk the Golden Gate Bridge, tour Alcatraz, ride cable cars up steep streets, and explore a major tech innovation hub.
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What to Pack for September
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. Don't forget a wide-brimmed hat and high-SPF sunscreen — the sun is strong.
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Frequently Asked Questions
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More San Francisco Guides
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Things to Do
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Cost & Budget
Daily costs, money-saving tips, and budget breakdown
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Overview
Complete travel guide for San Francisco: top things to do, itineraries, and typical costs.