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City and County of San Francisco (San Francisco)
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Weather in City and County of San Francisco, California for September 2025

Your guide to City and County of San Francisco weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in City and County of San Francisco has been significantly cooler than historical averages by -5.1 °F, with average temperature of 16 °F.

  • Expect cooler weather in the next days in City and County of San Francisco with the forecast suggesting a temperature of 19.2 °F, lower than the historical average.

  • In general, the average temperature in City and County of San Francisco at the beginning of September is 21.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 20.3 °F by the end of September.

    • Rain 🌧️

  • Precipitation in City and County of San Francisco during September is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/13°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
76 %
Avg humidity

City and County of San Francisco Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Cloudy
20°
2
Sunny
19°
3
Sunny
22°
4
Sunny
22°
5
Sunny
23°
6
Sunny
23°
7
Sunny
22°
8
Sunny
23°
9
Sunny
21°
10
Partly cloudy
19°
11
Sunny
20°
12
Sunny
20°
13
Sunny
20°
14
Sunny
21°
15
Partly cloudy
18°
16
Partly cloudy
16°
17
Mist
18°
18
Patchy rain possible
17°
19
Patchy rain possible
18°
20
Partly cloudy
20°
21
Sunny
22°
22
Sunny
22°
23
Sunny
19°
24
Sunny
20°
25
Sunny
19°
26
Sunny
20°
27
Sunny
22°
28
Sunny
18°
29
Partly cloudy
20°
30
Sunny
23°

Temperatures trend during September in City and County of San Francisco

See the weather trend as well as the moving average line

September weather in City and County of San Francisco day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Cloudy
Cloudy
 20° /12° 0 mm 4
Sept. 2 Sunny
Sunny
 19° /13° 0 mm 5
Sept. 3 Sunny
Sunny
 22° /13° 0 mm 6
Sept. 4 Sunny
Sunny
 22° /13° 0 mm 6
Sept. 5 Sunny
Sunny
 23° /14° 0 mm 6
Sept. 6 Sunny
Sunny
 23° /13° 0 mm 6
Sept. 7 Sunny
Sunny
 22° /13° 0 mm 6
Sept. 8 Sunny
Sunny
 23° /13° 0 mm 6
Sept. 9 Sunny
Sunny
 21° /13° 0 mm 5
Sept. 10 Partly cloudy
Partly cloudy
 19° /13° 0 mm 5
Sept. 11 Sunny
Sunny
 20° /13° 0.1 mm 5
Sept. 12 Sunny
Sunny
 20° /13° 0 mm 5
Sept. 13 Sunny
Sunny
 20° /12° 0 mm 5
Sept. 14 Sunny
Sunny
 21° /13° 0 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 18° /14° 0 mm 1.8
Sept. 16 Partly cloudy
Partly cloudy
 16° /13° 0 mm 1.7
Sept. 17 Mist
Mist
 18° /12° 0 mm 1.6
Sept. 18 Patchy rain possible
Patchy rain possible
 17° /14° 0.1 mm 1.1
Sept. 19 Patchy rain possible
Patchy rain possible
 18° /16° 4.6 mm 0
Sept. 20 Partly cloudy
Partly cloudy
 20° /16° 0 mm 5
Sept. 21 Sunny
Sunny
 22° /15° 0 mm 5
Sept. 22 Sunny
Sunny
 22° /16° 0 mm 5
Sept. 23 Sunny
Sunny
 19° /16° 0 mm 5
Sept. 24 Sunny
Sunny
 20° /15° 0 mm 5
Sept. 25 Sunny
Sunny
 19° /15° 0 mm 5
Sept. 26 Sunny
Sunny
 20° /14° 0 mm 5
Sept. 27 Sunny
Sunny
 22° /15° 0 mm 5
Sept. 28 Sunny
Sunny
 18° /14° 0 mm 5
Sept. 29 Partly cloudy
Partly cloudy
 20° /12° 0 mm 6
Sept. 30 Sunny
Sunny
 23° /12° 0.5 mm 6
Next
Important Notice
Our weather forecast for City and County of 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 City and County of San Francisco forecast closer to your planned date for the most up-to-date weather information.
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City and County of San Francisco in September - FAQ

What are the expected maximum and minimum temperatures in City and County of 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 City and County of San Francisco during September?
Rainfall in City and County of San Francisco during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in City and County of San Francisco during September?
The average wind speed in City and County of San Francisco during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in City and County of San Francisco

Explore the daily rainfall trends and prepare for City and County of San Franciscos September weather 💧

UV exposure in City and County of San Francisco during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is City and County of San Francisco?

Get accurate weather forecasts for City and County of San Francisco, located at latitude 37.775 and longitude -122.419. Stay updated with localized weather information tailored for City and County of San Francisco.

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