Measurements:
°C
°F
CURRENT WEATHER
05:59
San Francisco
60°F
N 6 mph
Feels like: 58°F
Precip: 13%
World Resorts USA San Francisco Weather

7 Day Weather Forecast

09.15
tue
DAY
66°F
NE 9 mph
precip
8%
NIGHT
60°F
NE 12 mph
precip
13%
09.16
wed
DAY
64°F
NE 13 mph
precip
21%
NIGHT
62°F
E 12 mph
precip
17%
09.17
thu
DAY
64°F
E 6 mph
precip
13%
NIGHT
62°F
E 5 mph
precip
12%
09.18
fri
DAY
66°F
E 5 mph
precip
7%
NIGHT
60°F
E 10 mph
precip
19%
09.19
sat
DAY
64°F
NE 9 mph
precip
13%
NIGHT
60°F
NE 8 mph
precip
21%
09.20
sun
DAY
64°F
NE 7 mph
precip
21%
NIGHT
62°F
NE 6 mph
precip
19%
09.21
mon
DAY
66°F
NE 6 mph
precip
10%
NIGHT
64°F
NE 6 mph
precip
14%

San Francisco Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for San Francisco was 18.1°F. The maximum and minimum values were 16.8°F and 19.8°F respectively.

San Francisco on the Weather Map

Best Time to Visit San Francisco
The most sunny months:
June 18 days
October 18 days
April 17 days
The most warm months:
August 67.4 °F
September 66.7 °F
October 65.7 °F
Warmest sea temperature:
September 63.4 °F
August 63.2 °F
October 61.8 °F
The most cold months:
December 54.8 °F
January 55.3 °F
February 56.3 °F
The most rainy months:
March 4 days
December 4 days
January 4 days
The most windy months:
May 9 mph
June 9 mph
April 9 mph
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