Weather in San Francisco in september 2025

The weather in San Francisco in the month of september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.

Average weather throughout september

perfect weather UV index: 6

Weather at 6am
63°F

Partly Cloudy

29%

Moderate rain at times

3%

Cloudy

3%

Weather at 12pm
77°F

Partly Cloudy

6%

Moderate rain at times

3%

Cloudy

2%

Weather at 6pm
67°F

Partly Cloudy

10%

Moderate rain at times

3%

Cloudy

2%

Weather at 3am
61°F

Clear/Sunny

68%

Partly Cloudy

21%

Fog

8%

Cloudy

3%



Evolution of daily average temperature and precipitation in San Francisco in september

These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Francisco in september.


The climate of San Francisco in september is perfect

September is one of the best periods to discover the city of San Francisco beneath the best weather conditions. Beautiful sunny and pleasantly warm days follow one another all the month long, since the weather in San Francisco throughout September is simply perfect.

San Francisco at the Beginning of September

The first days of September are dominated by the succession of beautiful sunny moments. In fact, most of the time, the pleasant mornings give way to the superb warm and bright afternoons. The weather then lends itself to the practice of all kinds of activities such as sightseeing or hanging out at the beach.

San Francisco in the Middle of September

By mid-September, temperatures are falling slightly. In general however, climatic conditions remain favorable to outdoor activities. The fine weather takes precedence over misty mornings as well as the few showers that show up from time to time. The climate throughout September in San Francisco provides comfortable warmth throughout the day.

San Francisco at the End of September

As at the beginning of the month, the comfortable warmth that enhances the beautiful sunny days enhances the feeling of well-being over the hours. Whether in the early morning or late night, one can benefit from the superb weather conditions from dawn to dusk.



Seasonal average climate and temperature of San Francisco in september

Check below seasonal norms These statistics are generated from the weather statements earlier years of september.

September
Outside temperature
Average temperature 70°F
Highest temperature 77°F
Lowest temperature 63°F
Highest record temperature 103°F
(2017)
Lowest record temperature 50°F
(2021)
Number of days at +86°F 4 day(s)
(13%)
Number of days at +65°F 30 day(s)
(100%)
Sea temperature
Average sea temperature 58°F
Lowest sea temperature 56°F
Highest sea temperature 59°F
Wind
Wind speed 16km/h
Wind temperature 63°F
Precipitation (rainfall)
Rainfall 0.2in
Number of days with rainfall 0 day(s)
(1%)
Record daily rainfall 0.3in
(2013)
Other climate data
Humidity 79%
Visibility 9.76km
Cloud cover 12%
UV index 6
Daily sunshine hours 12
Sunrise and sunset
Time of sunrise 05:52
Time of sunset 18:17
Length of day 12:25
Our opinion about the weather in september
Our opinion at whereandwhen.net perfect



How was the weather last september?

Here is the day by day recorded weather in San Francisco in september 2024:

01-09-2024
Clear/Sunny
56°F to 63°F
02-09-2024
Clear/Sunny
58°F to 65°F
03-09-2024
Clear/Sunny
58°F to 72°F
04-09-2024
Clear/Sunny
61°F to 70°F
05-09-2024
Clear/Sunny
61°F to 70°F
06-09-2024
Clear/Sunny
58°F to 65°F
07-09-2024
Clear/Sunny
58°F to 63°F
08-09-2024
Clear/Sunny
58°F to 63°F
09-09-2024
Clear/Sunny
56°F to 63°F
10-09-2024
Clear/Sunny
56°F to 61°F
11-09-2024
Clear/Sunny
56°F to 65°F
12-09-2024
Clear/Sunny
56°F to 65°F
13-09-2024
Clear/Sunny
56°F to 65°F
14-09-2024
Clear/Sunny
58°F to 63°F
15-09-2024
Partly Cloudy
58°F to 59°F
16-09-2024
Partly Cloudy
56°F to 61°F
17-09-2024
Overcast
56°F to 59°F
18-09-2024
Mist
58°F to 59°F
19-09-2024
Mist
54°F to 58°F
20-09-2024
Mist
54°F to 58°F
21-09-2024
Cloudy
56°F to 59°F
22-09-2024
Cloudy
54°F to 58°F
23-09-2024
Partly Cloudy
52°F to 59°F
24-09-2024
Cloudy
50°F to 58°F
25-09-2024
Overcast
54°F to 58°F
26-09-2024
Mist
56°F to 58°F
27-09-2024
Cloudy
52°F to 59°F
28-09-2024
Mist
54°F to 58°F
29-09-2024
Mist
54°F to 59°F
30-09-2024
Clear/Sunny
54°F to 65°F

Map: other cities in California in september

Cities near San Francisco:

Golden Gate National Recreation Area in septemberperfect weather
Oakland in septemberperfect weather
Stinson Beach in septemberperfect weather
Moss Beach in septemberperfect weather
Half Moon Bay in septemberperfect weather
Silicon Valley in septemberperfect weather
Point Reyes in septemberperfect weather
Pescadero in septemberperfect weather
San Jose in septemberperfect weather
Napa Valley in septemberperfect weather
Bodega Bay in septemberperfect weather
Santa Cruz California in septemberperfect weather
California in september: See full list of cities

Click over cities on the map for information about the weather in september.

Legend: San Francisco perfect weather good tolerable bad very bad


Weather data for San Francisco in september:

Weather data for San Francisco for september are derived from an average of the weather forecast since 2009 in San Francisco. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Francisco can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to San Francisco.


Weather in august in San Francisco
Weather in october in San Francisco
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