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September weather forecast in San Francisco

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	755 mmHg		73%
	5 m/s		+15

31 August, Sunday. day, 24°; night, 13°; clear

1 September, mon

	755 mmHg		72%
	4.8 m/s		+15

1 September, Monday. day, 24°; night, 13°; clear

2 September, tue

	755 mmHg		72%
	4.69 m/s		+15

2 September, Tuesday. day, 24°; night, 13°; clear

3 September, wed

	755 mmHg		71%
	4.9 m/s		+15

3 September, Wednesday. day, 23°; night, 13°; clear

4 September, thu

	756 mmHg		72%
	5.1 m/s		+15

4 September, Thursday. day, 23°; night, 13°; clear

5 September, fri

	756 mmHg		71%
	5 m/s		+15

5 September, Friday. day, 24°; night, 13°; clear

6 September, sat

	756 mmHg		69%
	4.6 m/s		+15

6 September, Saturday. day, 24°; night, 13°; clear

7 September, sun

	756 mmHg		70%
	4.69 m/s		+15

7 September, Sunday. day, 24°; night, 13°; clear

8 September, mon

	755 mmHg		71%
	4.9 m/s		+15

8 September, Monday. day, 24°; night, 13°; clear

9 September, tue

	755 mmHg		73%
	5 m/s		+15

9 September, Tuesday. day, 23°; night, 13°; clear

10 September, wed

	755 mmHg		76%
	4.8 m/s		+15

10 September, Wednesday. day, 22°; night, 13°; clear

11 September, thu

	756 mmHg		74%
	4.6 m/s		+15

11 September, Thursday. day, 23°; night, 13°; clear

12 September, fri

	756 mmHg		75%
	5 m/s		+15

12 September, Friday. day, 23°; night, 13°; partly cloudy

13 September, sat

	755 mmHg		74%
	4.9 m/s		+15

13 September, Saturday. day, 22°; night, 13°; partly cloudy

14 September, sun

	755 mmHg		77%
	5 m/s		+15

14 September, Sunday. day, 22°; night, 13°; partly cloudy

15 September, mon

	756 mmHg		77%
	5.4 m/s		+15

15 September, Monday. day, 21°; night, 13°; partly cloudy

16 September, tue

	756 mmHg		76%
	5.6 m/s		+15

16 September, Tuesday. day, 21°; night, 13°; partly cloudy

17 September, wed

	756 mmHg		74%
	5.5 m/s		+15

17 September, Wednesday. day, 22°; night, 13°; partly cloudy

18 September, thu

	756 mmHg		73%
	5.1 m/s		+15

18 September, Thursday. day, 23°; night, 14°; partly cloudy

19 September, fri

	756 mmHg		72%
	4.8 m/s		+15

19 September, Friday. day, 23°; night, 13°; clear

20 September, sat

	755 mmHg		70%
	4.69 m/s		+15

20 September, Saturday. day, 23°; night, 13°; clear

21 September, sun

	755 mmHg		70%
	4.6 m/s		+15

21 September, Sunday. day, 23°; night, 13°; clear

22 September, mon

	756 mmHg		73%
	4.6 m/s		+15

22 September, Monday. day, 23°; night, 12°; clear

23 September, tue

	756 mmHg		71%
	4.3 m/s		+15

23 September, Tuesday. day, 23°; night, 12°; clear

24 September, wed

	756 mmHg		71%
	4.4 m/s		+15

24 September, Wednesday. day, 23°; night, 13°; clear

25 September, thu

	756 mmHg		72%
	4.4 m/s		+15

25 September, Thursday. day, 23°; night, 13°; rain

26 September, fri

	756 mmHg		71%
	4.5 m/s		+15

26 September, Friday. day, 23°; night, 13°; clear

27 September, sat

	756 mmHg		71%
	4.5 m/s		+15

27 September, Saturday. day, 23°; night, 13°; clear

28 September, sun

	756 mmHg		71%
	4.69 m/s		+15

28 September, Sunday. day, 23°; night, 13°; clear

29 September, mon

	756 mmHg		72%
	4.9 m/s		+15

29 September, Monday. day, 22°; night, 13°; partly cloudy

30 September, tue

	756 mmHg		73%
	4.5 m/s		+15

30 September, Tuesday. day, 22°; night, 12°; partly cloudy

1 October, wed

	756 mmHg		69%
	4.4 m/s		+15

1 October, Wednesday. day, 22°; night, 13°; clear

2 October, thu

	757 mmHg		67%
	4.5 m/s		+14

2 October, Thursday. day, 22°; night, 13°; clear

3 October, fri

	756 mmHg		69%
	4.9 m/s		+14

3 October, Friday. day, 22°; night, 12°; clear

4 October, sat

	756 mmHg		67%
	5.2 m/s		+14

4 October, Saturday. day, 21°; night, 13°; clear

Average data for 10 years

San Francisco September

20

sunny days

1

day with precipitation

9

cloudy days

20 sunny days; 1 day with precipitation; 9 cloudy days;

72

%

air humidity

2.9

m/s

WindW

4

mm of precipitation

(1% of annual average)

+15

°C

Water temperature

air humidity 72%; 4 millimeters of precipitation (1% of annual average); Wind westerly 2.9 Meters per second; Water temperature +15°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

W

SW

W

W

W

W

W

W

W

SW

W

W

SW

W

W

W

W

W

SW

SW

SW

W

SW

W

SW

W

W

SW

W

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Sacramento
Oakland
San Jose
Redding
Monterey
Palo Alto
Washington
Santa Cruz
Fremont

Cities with similar weather in September

Sydney
Toronto
Vancouver
Genoa
Boston
Seattle
Lima
Brisbane
San Remo

The weather forecast for September 2025 is based on historical data from the past 10 years.

September in San Francisco is the warmest month of the year. In September, the weather in San Francisco is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, San Francisco has 20 sunny, 9 partly cloudy, and 1 rainy day in September. The rains are usually light. September as well as June, July, and August is considered the most comfortable time to visit San Francisco.

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