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September weather forecast in Vallejo

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		60%
	4.1 m/s		+23

31 August, Sunday. day, 30°; night, 14°; clear

1 September, mon

	755 mmHg		60%
	4 m/s		+24

1 September, Monday. day, 30°; night, 14°; clear

2 September, tue

	755 mmHg		58%
	4 m/s		+23

2 September, Tuesday. day, 30°; night, 14°; clear

3 September, wed

	756 mmHg		58%
	4.1 m/s		+22

3 September, Wednesday. day, 30°; night, 14°; clear

4 September, thu

	756 mmHg		60%
	4.19 m/s		+23

4 September, Thursday. day, 30°; night, 14°; clear

5 September, fri

	756 mmHg		58%
	4.1 m/s		+24

5 September, Friday. day, 30°; night, 14°; clear

6 September, sat

	756 mmHg		54%
	3.7 m/s		+24

6 September, Saturday. day, 31°; night, 14°; clear

7 September, sun

	756 mmHg		57%
	4 m/s		+23

7 September, Sunday. day, 31°; night, 14°; clear

8 September, mon

	755 mmHg		57%
	4.19 m/s		+23

8 September, Monday. day, 31°; night, 14°; clear

9 September, tue

	755 mmHg		60%
	4.19 m/s		+24

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

10 September, wed

	756 mmHg		64%
	4.1 m/s		+24

10 September, Wednesday. day, 29°; night, 13°; clear

11 September, thu

	757 mmHg		62%
	3.8 m/s		+21

11 September, Thursday. day, 29°; night, 14°; clear

12 September, fri

	756 mmHg		62%
	4 m/s		+21

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

13 September, sat

	756 mmHg		62%
	4 m/s		+20

13 September, Saturday. day, 28°; night, 14°; partly cloudy

14 September, sun

	756 mmHg		66%
	4.1 m/s		+21

14 September, Sunday. day, 28°; night, 13°; partly cloudy

15 September, mon

	756 mmHg		66%
	4.4 m/s		+21

15 September, Monday. day, 26°; night, 13°; partly cloudy

16 September, tue

	757 mmHg		65%
	4.4 m/s		+21

16 September, Tuesday. day, 26°; night, 13°; clear

17 September, wed

	757 mmHg		64%
	4.3 m/s		+22

17 September, Wednesday. day, 27°; night, 13°; clear

18 September, thu

	756 mmHg		61%
	4.1 m/s		+24

18 September, Thursday. day, 28°; night, 14°; partly cloudy

19 September, fri

	756 mmHg		60%
	3.9 m/s		+24

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

20 September, sat

	756 mmHg		58%
	3.7 m/s		+22

20 September, Saturday. day, 29°; night, 14°; clear

21 September, sun

	756 mmHg		58%
	3.8 m/s		+22

21 September, Sunday. day, 29°; night, 13°; clear

22 September, mon

	756 mmHg		61%
	3.7 m/s		+23

22 September, Monday. day, 28°; night, 13°; clear

23 September, tue

	757 mmHg		60%
	3.5 m/s		+22

23 September, Tuesday. day, 29°; night, 12°; clear

24 September, wed

	757 mmHg		57%
	3.5 m/s		+23

24 September, Wednesday. day, 29°; night, 13°; clear

25 September, thu

	757 mmHg		58%
	3.7 m/s		+23

25 September, Thursday. day, 29°; night, 13°; rain

26 September, fri

	757 mmHg		58%
	3.5 m/s		+25

26 September, Friday. day, 29°; night, 13°; clear

27 September, sat

	757 mmHg		58%
	3.7 m/s		+25

27 September, Saturday. day, 29°; night, 13°; clear

28 September, sun

	756 mmHg		58%
	3.9 m/s		+21

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

29 September, mon

	757 mmHg		60%
	3.9 m/s		+21

29 September, Monday. day, 27°; night, 13°; clear

30 September, tue

	757 mmHg		62%
	3.7 m/s		+22

30 September, Tuesday. day, 27°; night, 13°; partly cloudy

1 October, wed

	757 mmHg		58%
	3.6 m/s		+23

1 October, Wednesday. day, 27°; night, 13°; clear

2 October, thu

	757 mmHg		56%
	3.6 m/s		+22

2 October, Thursday. day, 27°; night, 13°; clear

3 October, fri

	757 mmHg		58%
	3.9 m/s		+21

3 October, Friday. day, 27°; night, 12°; clear

4 October, sat

	757 mmHg		57%
	4.19 m/s		+20

4 October, Saturday. day, 26°; night, 13°; clear

Average data for 10 years

Vallejo September

24

sunny days

1

day with precipitation

5

cloudy days

24 sunny days; 1 day with precipitation; 5 cloudy days;

60

%

air humidity

2.2

m/s

WindSW

4

mm of precipitation

(1% of annual average)

+23

°C

Water temperature

air humidity 60%; 4 millimeters of precipitation (1% of annual average); Wind south-westerly 2.2 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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

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

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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

Podgorica
Genoa
Boston
Marseilles
Seattle
Lima
Brisbane
Albena
San Remo

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

In September, the weather in Vallejo is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Vallejo has 24 sunny, 5 partly cloudy, and 1 rainy day in September. The rains are usually light.

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