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August weather forecast in Simi Valley

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

27 July, sun

	704 mmHg		51%
	3.2 m/s		+21

27 July, Sunday. day, 31°; night, 19°; clear

28 July, mon

	704 mmHg		52%
	3.1 m/s		+21

28 July, Monday. day, 30°; night, 18°; clear

29 July, tue

	704 mmHg		52%
	3 m/s		+21

29 July, Tuesday. day, 31°; night, 18°; clear

30 July, wed

	704 mmHg		52%
	3.1 m/s		+21

30 July, Wednesday. day, 30°; night, 18°; clear

31 July, thu

	704 mmHg		52%
	3.2 m/s		+21

31 July, Thursday. day, 30°; night, 18°; clear

1 August, fri

	705 mmHg		51%
	3.1 m/s		+21

1 August, Friday. day, 30°; night, 18°; clear

2 August, sat

	705 mmHg		49%
	3.1 m/s		+22

2 August, Saturday. day, 31°; night, 18°; clear

3 August, sun

	704 mmHg		49%
	3.2 m/s		+21

3 August, Sunday. day, 30°; night, 18°; partly cloudy

4 August, mon

	704 mmHg		49%
	3.2 m/s		+22

4 August, Monday. day, 30°; night, 18°; clear

5 August, tue

	704 mmHg		47%
	3.3 m/s		+21

5 August, Tuesday. day, 30°; night, 18°; clear

6 August, wed

	704 mmHg		48%
	3.3 m/s		+21

6 August, Wednesday. day, 30°; night, 17°; clear

7 August, thu

	704 mmHg		50%
	3.3 m/s		+21

7 August, Thursday. day, 30°; night, 17°; clear

8 August, fri

	704 mmHg		49%
	3.3 m/s		+21

8 August, Friday. day, 30°; night, 18°; clear

9 August, sat

	704 mmHg		48%
	3.3 m/s		+21

9 August, Saturday. day, 30°; night, 18°; clear

10 August, sun

	704 mmHg		49%
	3.2 m/s		+21

10 August, Sunday. day, 30°; night, 18°; clear

11 August, mon

	704 mmHg		49%
	3.1 m/s		+21

11 August, Monday. day, 30°; night, 18°; clear

12 August, tue

	704 mmHg		47%
	3.1 m/s		+21

12 August, Tuesday. day, 31°; night, 18°; clear

13 August, wed

	704 mmHg		46%
	3.1 m/s		+21

13 August, Wednesday. day, 31°; night, 18°; clear

14 August, thu

	704 mmHg		45%
	3.2 m/s		+21

14 August, Thursday. day, 31°; night, 19°; clear

15 August, fri

	704 mmHg		46%
	3.2 m/s		+21

15 August, Friday. day, 31°; night, 19°; clear

16 August, sat

	704 mmHg		47%
	3.2 m/s		+21

16 August, Saturday. day, 31°; night, 18°; clear

17 August, sun

	704 mmHg		47%
	3.2 m/s		+21

17 August, Sunday. day, 31°; night, 18°; clear

18 August, mon

	704 mmHg		48%
	3.3 m/s		+21

18 August, Monday. day, 30°; night, 18°; clear

19 August, tue

	704 mmHg		49%
	3.3 m/s		+21

19 August, Tuesday. day, 30°; night, 18°; clear

20 August, wed

	703 mmHg		51%
	3.3 m/s		+21

20 August, Wednesday. day, 29°; night, 17°; clear

21 August, thu

	704 mmHg		52%
	3.3 m/s		+21

21 August, Thursday. day, 29°; night, 17°; clear

22 August, fri

	704 mmHg		51%
	3.1 m/s		+21

22 August, Friday. day, 29°; night, 17°; clear

23 August, sat

	704 mmHg		50%
	3.2 m/s		+21

23 August, Saturday. day, 30°; night, 17°; clear

24 August, sun

	704 mmHg		47%
	3.2 m/s		+22

24 August, Sunday. day, 30°; night, 17°; clear

25 August, mon

	704 mmHg		45%
	3.3 m/s		+22

25 August, Monday. day, 31°; night, 18°; clear

26 August, tue

	704 mmHg		46%
	3.1 m/s		+22

26 August, Tuesday. day, 31°; night, 18°; clear

27 August, wed

	703 mmHg		46%
	3.2 m/s		+21

27 August, Wednesday. day, 31°; night, 17°; clear

28 August, thu

	703 mmHg		44%
	3 m/s		+21

28 August, Thursday. day, 32°; night, 18°; clear

29 August, fri

	703 mmHg		43%
	3.1 m/s		+22

29 August, Friday. day, 32°; night, 18°; clear

30 August, sat

	703 mmHg		45%
	3.2 m/s		+22

30 August, Saturday. day, 31°; night, 18°; clear

31 August, sun

	703 mmHg		46%
	3.2 m/s		+22

31 August, Sunday. day, 31°; night, 18°; clear

1 September, mon

	703 mmHg		47%
	3.1 m/s		+22

1 September, Monday. day, 30°; night, 18°; clear

2 September, tue

	703 mmHg		48%
	3.1 m/s		+22

2 September, Tuesday. day, 30°; night, 18°; clear

3 September, wed

	703 mmHg		49%
	3 m/s		+22

3 September, Wednesday. day, 30°; night, 18°; rain

4 September, thu

	703 mmHg		48%
	3 m/s		+22

4 September, Thursday. day, 30°; night, 18°; clear

5 September, fri

	703 mmHg		47%
	3.1 m/s		+22

5 September, Friday. day, 31°; night, 17°; clear

6 September, sat

	704 mmHg		45%
	3 m/s		+22

6 September, Saturday. day, 31°; night, 18°; clear

Average data for 10 years

Simi Valley August

30

sunny days

0

days with precipitation

1

cloudy day

30 sunny days; 0 days with precipitation; 1 cloudy day;

48

%

air humidity

1.5

m/s

WindSW

4

mm of precipitation

(2% of annual average)

+21

°C

Water temperature

air humidity 48%; 4 millimeters of precipitation (2% of annual average); Wind south-westerly 1.5 Meters per second; Water temperature +21°

Weather graphs for August

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

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

31

Daytime temperature

Night-time temperature

Cities near you

Los Angeles
San Diego
Santa Monica
Beverly Hills
Monterey
Mexicali
Santa Barbara
Glendale
San Luis Obispo

Cities with similar weather in August

Victoria
Marseilles
Casablanca
Kathmandu
Bali
Sacramento
Denver
Caracas
Loanda

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

August in Simi Valley is the sunniest and the hottest month of the year. In August, the weather in Simi Valley is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Simi Valley has 30 sunny and 1 partly cloudy day in August.

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