San Francisco in september: average Weather, Temperature and Climate
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
Clear/Sunny
64% of time
29%
3%
3%
Weather at 12pm
77°F
Clear/Sunny
89% of time
6%
3%
2%
Weather at 6pm
67°F
Clear/Sunny
86% of time
10%
3%
2%
Weather at 3am
61°F
68%
21%
8%
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:
56°F to 63°F
58°F to 65°F
58°F to 72°F
61°F to 70°F
61°F to 70°F
58°F to 65°F
58°F to 63°F
58°F to 63°F
56°F to 63°F
56°F to 61°F
56°F to 65°F
56°F to 65°F
56°F to 65°F
58°F to 63°F
58°F to 59°F
56°F to 61°F
56°F to 59°F
58°F to 59°F
54°F to 58°F
54°F to 58°F
56°F to 59°F
54°F to 58°F
52°F to 59°F
50°F to 58°F
54°F to 58°F
56°F to 58°F
52°F to 59°F
54°F to 58°F
54°F to 59°F
54°F to 65°F
Map: other cities in California in september
Cities near San Francisco:
Golden Gate National Recreation Area in september | perfect weather |
Oakland in september | perfect weather |
Stinson Beach in september | perfect weather |
Moss Beach in september | perfect weather |
Half Moon Bay in september | perfect weather |
Silicon Valley in september | perfect weather |
Point Reyes in september | perfect weather |
Pescadero in september | perfect weather |
San Jose in september | perfect weather |
Napa Valley in september | perfect weather |
Bodega Bay in september | perfect weather |
Santa Cruz California in september | perfect weather |
Click over cities on the map for information about the weather in september.
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.