San Francisco (CA)
September
Weather in San Francisco, California for September 2027
Your guide to San Francisco weather in September - trends and predictions
In general, the average temperature in San Francisco at the beginning of September is 20.9 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 19.4 °C by the end of September.
Precipitation in San Francisco during September is a rare event, with an average of fewer than 2 rainy days.
Is September a good time to visit San Francisco? check out the best time to travel to San Francisco page.
✨ Is September a good time to visit San Francisco? – Ask the AI Weatherman
Temperatures
Rain 🌧️
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29
Dry days
1
Rainy days
0
Snow days
20°/13°
Temperatures
17 km/h
Avg max wind
79 %
Avg humidity
San Francisco Weather September
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Temperatures trend during September in San Francisco
See the weather trend as well as the moving average line
September weather in San Francisco day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 19° /13° | 0.7 mm | 4 | |
| Sept. 2 |  Sunny | 19° /13° | 0 mm | 6 | |
| Sept. 3 | Patchy rain possible | 21° /13° | 1.8 mm | 5 | |
| Sept. 4 | Sunny | 22° /14° | 0.1 mm | 6 | |
| Sept. 5 | Sunny | 22° /14° | 0 mm | 7 | |
| Sept. 6 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 7 | Sunny | 21° /14° | 0 mm | 6 | |
| Sept. 8 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 9 | Sunny | 22° /14° | 0 mm | 5 | |
| Sept. 10 |  Partly cloudy | 19° /13° | 0 mm | 5 | |
| Sept. 11 | Sunny | 20° /13° | 0.1 mm | 6 | |
| Sept. 12 | Sunny | 20° /13° | 0 mm | 6 | |
| Sept. 13 | Sunny | 20° /13° | 0 mm | 6 | |
| Sept. 14 | Sunny | 21° /13° | 0 mm | 5 | |
| Sept. 15 | Sunny | 19° /13° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 18° /13° | 0.1 mm | 5 | |
| Sept. 17 |  Mist | 18° /13° | 0.4 mm | 5 | |
| Sept. 18 |  Moderate or heavy rain shower | 18° /13° | 7.1 mm | 5 | |
| Sept. 19 |  Overcast | 18° /14° | 0.2 mm | 4 | |
| Sept. 20 | Overcast | 19° /13° | 0.1 mm | 4 | |
| Sept. 21 | Mist | 19° /14° | 0.1 mm | 4 | |
| Sept. 22 | Fog | 20° /13° | 0 mm | 5 | |
| Sept. 23 | Sunny | 21° /13° | 0 mm | 5 | |
| Sept. 24 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 25 | Sunny | 19° /13° | 0 mm | 5 | |
| Sept. 26 | Partly cloudy | 19° /13° | 0 mm | 5 | |
| Sept. 27 | Fog | 18° /13° | 0 mm | 5 | |
| Sept. 28 | Mist | 19° /12° | 0 mm | 5 | |
| Sept. 29 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 30 | Sunny | 22° /14° | 0.3 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for San Francisco in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Francisco forecast closer to your planned date for the most up-to-date weather information.
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San Francisco in September - FAQ
What are the expected maximum and minimum temperatures in San Francisco during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Francisco during September?
Expect minimal rainfall in San Francisco during September, with a total of 11 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Francisco during September?
The average wind speed in San Francisco during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in San Francisco
Explore the daily rainfall trends and prepare for San Franciscos September weather 💧
Typically, San Francisco has 1 rainy days in September with a total of 11 mm of rainfall.
UV exposure in San Francisco during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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