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September weather forecast in El Cajon

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

	733 mmHg		65%
	3.7 m/s		+22

31 August, Sunday. day, 29°; night, 19°; clear

1 September, mon

	733 mmHg		65%
	3.7 m/s		+22

1 September, Monday. day, 29°; night, 19°; clear

2 September, tue

	733 mmHg		67%
	3.6 m/s		+22

2 September, Tuesday. day, 29°; night, 19°; clear

3 September, wed

	733 mmHg		68%
	3.9 m/s		+22

3 September, Wednesday. day, 29°; night, 19°; clear

4 September, thu

	733 mmHg		68%
	3.9 m/s		+21

4 September, Thursday. day, 29°; night, 19°; clear

5 September, fri

	733 mmHg		65%
	3.6 m/s		+21

5 September, Friday. day, 30°; night, 19°; clear

6 September, sat

	734 mmHg		65%
	3.7 m/s		+21

6 September, Saturday. day, 29°; night, 19°; clear

7 September, sun

	734 mmHg		66%
	3.8 m/s		+21

7 September, Sunday. day, 29°; night, 19°; clear

8 September, mon

	733 mmHg		67%
	3.8 m/s		+21

8 September, Monday. day, 28°; night, 19°; clear

9 September, tue

	733 mmHg		66%
	3.9 m/s		+21

9 September, Tuesday. day, 28°; night, 18°; clear

10 September, wed

	733 mmHg		68%
	3.8 m/s		+21

10 September, Wednesday. day, 28°; night, 18°; clear

11 September, thu

	734 mmHg		66%
	3.8 m/s		+21

11 September, Thursday. day, 28°; night, 18°; clear

12 September, fri

	734 mmHg		66%
	3.9 m/s		+21

12 September, Friday. day, 28°; night, 18°; clear

13 September, sat

	733 mmHg		68%
	3.7 m/s		+21

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

14 September, sun

	733 mmHg		67%
	3.7 m/s		+21

14 September, Sunday. day, 27°; night, 17°; clear

15 September, mon

	734 mmHg		68%
	3.7 m/s		+21

15 September, Monday. day, 27°; night, 17°; clear

16 September, tue

	734 mmHg		68%
	3.6 m/s		+21

16 September, Tuesday. day, 26°; night, 17°; partly cloudy

17 September, wed

	734 mmHg		68%
	3.6 m/s		+21

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

18 September, thu

	734 mmHg		68%
	3.7 m/s		+21

18 September, Thursday. day, 26°; night, 16°; clear

19 September, fri

	733 mmHg		69%
	3.7 m/s		+21

19 September, Friday. day, 26°; night, 16°; clear

20 September, sat

	733 mmHg		70%
	3.6 m/s		+21

20 September, Saturday. day, 26°; night, 16°; rain

21 September, sun

	734 mmHg		70%
	3.8 m/s		+21

21 September, Sunday. day, 26°; night, 16°; clear

22 September, mon

	734 mmHg		67%
	3.8 m/s		+21

22 September, Monday. day, 26°; night, 16°; partly cloudy

23 September, tue

	734 mmHg		65%
	3.7 m/s		+21

23 September, Tuesday. day, 27°; night, 16°; partly cloudy

24 September, wed

	734 mmHg		63%
	3.7 m/s		+21

24 September, Wednesday. day, 28°; night, 16°; clear

25 September, thu

	734 mmHg		65%
	3.8 m/s		+21

25 September, Thursday. day, 27°; night, 16°; clear

26 September, fri

	734 mmHg		67%
	3.7 m/s		+21

26 September, Friday. day, 26°; night, 17°; clear

27 September, sat

	734 mmHg		67%
	3.6 m/s		+21

27 September, Saturday. day, 27°; night, 17°; clear

28 September, sun

	734 mmHg		66%
	3.5 m/s		+21

28 September, Sunday. day, 27°; night, 16°; partly cloudy

29 September, mon

	734 mmHg		65%
	3.7 m/s		+21

29 September, Monday. day, 26°; night, 16°; partly cloudy

30 September, tue

	734 mmHg		63%
	3.6 m/s		+21

30 September, Tuesday. day, 27°; night, 16°; clear

1 October, wed

	734 mmHg		63%
	3.6 m/s		+21

1 October, Wednesday. day, 27°; night, 16°; clear

2 October, thu

	734 mmHg		63%
	3.6 m/s		+21

2 October, Thursday. day, 26°; night, 16°; clear

3 October, fri

	734 mmHg		65%
	3.6 m/s		+21

3 October, Friday. day, 26°; night, 15°; clear

4 October, sat

	734 mmHg		67%
	3.9 m/s		+20

4 October, Saturday. day, 25°; night, 15°; partly cloudy

Average data for 10 years

El Cajon September

24

sunny days

1

day with precipitation

5

cloudy days

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

67

%

air humidity

1.6

m/s

WindSW

8

mm of precipitation

(2% of annual average)

+21

°C

Water temperature

air humidity 67%; 8 millimeters of precipitation (2% of annual average); Wind south-westerly 1.6 Meters per second; Water temperature +21°

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

S

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

Los Angeles
Las Vegas
San Diego
Yuma
Santa Monica
Beverly Hills
Mexicali
Santa Barbara
Glendale

Cities with similar weather in September

Bodrum
Malaga
Alicante
Naples
Majorca
Palermo
Rio de Janeiro
Kerkyra
Retimno

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

In September, the weather in El Cajon is typically warm. Average daily high temperature in September is about 27 degrees above zero. On average, El Cajon has 24 sunny, 5 partly cloudy, and 1 rainy day in September. The rains are usually light.

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