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September weather forecast in Petaluma

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

	752 mmHg		58%
	3.4 m/s		+23

31 August, Sunday. day, 29°; night, 14°; clear

1 September, mon

	752 mmHg		58%
	3.3 m/s		+24

1 September, Monday. day, 29°; night, 14°; clear

2 September, tue

	752 mmHg		57%
	3.2 m/s		+23

2 September, Tuesday. day, 29°; night, 14°; clear

3 September, wed

	753 mmHg		58%
	3.4 m/s		+22

3 September, Wednesday. day, 29°; night, 14°; clear

4 September, thu

	753 mmHg		58%
	3.5 m/s		+23

4 September, Thursday. day, 29°; night, 13°; clear

5 September, fri

	753 mmHg		57%
	3.5 m/s		+24

5 September, Friday. day, 29°; night, 14°; clear

6 September, sat

	753 mmHg		55%
	3.3 m/s		+24

6 September, Saturday. day, 30°; night, 14°; clear

7 September, sun

	753 mmHg		56%
	3.4 m/s		+23

7 September, Sunday. day, 30°; night, 14°; clear

8 September, mon

	752 mmHg		56%
	3.5 m/s		+23

8 September, Monday. day, 29°; night, 14°; clear

9 September, tue

	752 mmHg		58%
	3.3 m/s		+24

9 September, Tuesday. day, 28°; night, 14°; clear

10 September, wed

	753 mmHg		62%
	3.2 m/s		+24

10 September, Wednesday. day, 28°; night, 13°; clear

11 September, thu

	753 mmHg		61%
	3.2 m/s		+21

11 September, Thursday. day, 28°; night, 14°; clear

12 September, fri

	753 mmHg		62%
	3.3 m/s		+21

12 September, Friday. day, 28°; night, 14°; clear

13 September, sat

	753 mmHg		62%
	3.4 m/s		+20

13 September, Saturday. day, 27°; night, 14°; partly cloudy

14 September, sun

	753 mmHg		66%
	3.3 m/s		+21

14 September, Sunday. day, 27°; night, 13°; clear

15 September, mon

	753 mmHg		66%
	3.8 m/s		+21

15 September, Monday. day, 26°; night, 12°; clear

16 September, tue

	753 mmHg		66%
	4 m/s		+21

16 September, Tuesday. day, 26°; night, 12°; clear

17 September, wed

	754 mmHg		65%
	3.8 m/s		+22

17 September, Wednesday. day, 26°; night, 13°; clear

18 September, thu

	753 mmHg		64%
	3.5 m/s		+24

18 September, Thursday. day, 26°; night, 13°; partly cloudy

19 September, fri

	753 mmHg		62%
	3.4 m/s		+24

19 September, Friday. day, 27°; night, 13°; rain

20 September, sat

	753 mmHg		60%
	3.2 m/s		+22

20 September, Saturday. day, 28°; night, 13°; clear

21 September, sun

	753 mmHg		58%
	3.2 m/s		+22

21 September, Sunday. day, 27°; night, 13°; clear

22 September, mon

	753 mmHg		61%
	3.3 m/s		+23

22 September, Monday. day, 27°; night, 12°; clear

23 September, tue

	754 mmHg		60%
	3.1 m/s		+22

23 September, Tuesday. day, 27°; night, 12°; clear

24 September, wed

	754 mmHg		58%
	3 m/s		+23

24 September, Wednesday. day, 28°; night, 13°; clear

25 September, thu

	754 mmHg		61%
	3 m/s		+23

25 September, Thursday. day, 27°; night, 13°; clear

26 September, fri

	754 mmHg		60%
	3 m/s		+25

26 September, Friday. day, 28°; night, 13°; clear

27 September, sat

	754 mmHg		61%
	3 m/s		+25

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

28 September, sun

	753 mmHg		60%
	3.3 m/s		+21

28 September, Sunday. day, 27°; night, 13°; clear

29 September, mon

	754 mmHg		62%
	3.4 m/s		+21

29 September, Monday. day, 26°; night, 12°; clear

30 September, tue

	754 mmHg		64%
	3.1 m/s		+22

30 September, Tuesday. day, 26°; night, 12°; partly cloudy

1 October, wed

	754 mmHg		61%
	3 m/s		+23

1 October, Wednesday. day, 26°; night, 12°; clear

2 October, thu

	754 mmHg		58%
	3.2 m/s		+22

2 October, Thursday. day, 26°; night, 12°; clear

3 October, fri

	754 mmHg		60%
	3.6 m/s		+21

3 October, Friday. day, 25°; night, 12°; clear

4 October, sat

	754 mmHg		58%
	3.7 m/s		+20

4 October, Saturday. day, 24°; night, 12°; clear

Average data for 10 years

Petaluma September

26

sunny days

1

day with precipitation

3

cloudy days

26 sunny days; 1 day with precipitation; 3 cloudy days;

61

%

air humidity

1.7

m/s

WindSW

5

mm of precipitation

(1% of annual average)

+23

°C

Water temperature

air humidity 61%; 5 millimeters of precipitation (1% of annual average); Wind south-westerly 1.7 Meters per second; Water temperature +23°

Weather graphs for September

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

W

W

SW

SW

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

SW

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

San Francisco
Sacramento
Oakland
Redding
Monterey
San Jose
Reno
Stanford
San Luis Obispo

Cities with similar weather in September

Varna
Podgorica
The Golden Sands
Genoa
Boston
Seattle
Lima
Brisbane
Albena

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

In September, the weather in Petaluma is typically warm. Average daily high temperature in September is about 28 degrees above zero. On average, Petaluma has 26 sunny, 3 partly cloudy, and 1 rainy day in September. The rains are usually light. September as well as May, June, and October is considered the most comfortable time to visit Petaluma.

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