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September weather forecast in San Luis Obispo

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

	732 mmHg		66%
	3.2 m/s		+19

31 August, Sunday. day, 27°; night, 15°; clear

1 September, mon

	732 mmHg		67%
	3.1 m/s		+19

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

2 September, tue

	732 mmHg		67%
	3.2 m/s		+19

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

3 September, wed

	732 mmHg		67%
	3.4 m/s		+19

3 September, Wednesday. day, 27°; night, 16°; clear

4 September, thu

	732 mmHg		65%
	3.3 m/s		+18

4 September, Thursday. day, 26°; night, 15°; clear

5 September, fri

	732 mmHg		64%
	3.2 m/s		+18

5 September, Friday. day, 27°; night, 15°; clear

6 September, sat

	733 mmHg		63%
	3.1 m/s		+18

6 September, Saturday. day, 27°; night, 15°; clear

7 September, sun

	732 mmHg		63%
	3.1 m/s		+18

7 September, Sunday. day, 27°; night, 15°; clear

8 September, mon

	732 mmHg		67%
	3.3 m/s		+18

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

9 September, tue

	732 mmHg		68%
	3.5 m/s		+18

9 September, Tuesday. day, 25°; night, 15°; clear

10 September, wed

	732 mmHg		69%
	3.3 m/s		+18

10 September, Wednesday. day, 25°; night, 14°; clear

11 September, thu

	733 mmHg		69%
	3.2 m/s		+18

11 September, Thursday. day, 25°; night, 14°; partly cloudy

12 September, fri

	733 mmHg		70%
	3.3 m/s		+18

12 September, Friday. day, 25°; night, 15°; clear

13 September, sat

	732 mmHg		69%
	3.3 m/s		+18

13 September, Saturday. day, 25°; night, 15°; clear

14 September, sun

	732 mmHg		71%
	3.4 m/s		+18

14 September, Sunday. day, 25°; night, 14°; clear

15 September, mon

	733 mmHg		71%
	3.5 m/s		+19

15 September, Monday. day, 24°; night, 14°; clear

16 September, tue

	733 mmHg		69%
	3.5 m/s		+18

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

17 September, wed

	733 mmHg		67%
	3.4 m/s		+18

17 September, Wednesday. day, 24°; night, 14°; clear

18 September, thu

	732 mmHg		67%
	3.5 m/s		+18

18 September, Thursday. day, 25°; night, 14°; clear

19 September, fri

	732 mmHg		67%
	3.3 m/s		+18

19 September, Friday. day, 25°; night, 14°; clear

20 September, sat

	732 mmHg		69%
	3.2 m/s		+18

20 September, Saturday. day, 25°; night, 14°; clear

21 September, sun

	732 mmHg		69%
	3.3 m/s		+18

21 September, Sunday. day, 24°; night, 14°; clear

22 September, mon

	733 mmHg		69%
	3.4 m/s		+19

22 September, Monday. day, 24°; night, 14°; clear

23 September, tue

	733 mmHg		68%
	3.1 m/s		+20

23 September, Tuesday. day, 25°; night, 14°; clear

24 September, wed

	733 mmHg		66%
	3.1 m/s		+19

24 September, Wednesday. day, 25°; night, 14°; clear

25 September, thu

	733 mmHg		66%
	3.3 m/s		+20

25 September, Thursday. day, 25°; night, 14°; clear

26 September, fri

	733 mmHg		68%
	3.3 m/s		+19

26 September, Friday. day, 25°; night, 14°; clear

27 September, sat

	733 mmHg		67%
	3.1 m/s		+19

27 September, Saturday. day, 25°; night, 14°; clear

28 September, sun

	733 mmHg		68%
	3.2 m/s		+18

28 September, Sunday. day, 24°; night, 14°; partly cloudy

29 September, mon

	733 mmHg		68%
	3.4 m/s		+18

29 September, Monday. day, 25°; night, 14°; clear

30 September, tue

	733 mmHg		66%
	3.3 m/s		+19

30 September, Tuesday. day, 25°; night, 14°; clear

1 October, wed

	733 mmHg		65%
	3.3 m/s		+19

1 October, Wednesday. day, 24°; night, 13°; clear

2 October, thu

	733 mmHg		64%
	3.2 m/s		+18

2 October, Thursday. day, 25°; night, 13°; clear

3 October, fri

	733 mmHg		66%
	3.6 m/s		+17

3 October, Friday. day, 24°; night, 13°; clear

4 October, sat

	733 mmHg		66%
	3.6 m/s		+16

4 October, Saturday. day, 23°; night, 12°; clear

Average data for 10 years

San Luis Obispo September

28

sunny days

0

days with precipitation

2

cloudy days

28 sunny days; 0 days with precipitation; 2 cloudy days;

67

%

air humidity

1.7

m/s

WindS

3

mm of precipitation

(1% of annual average)

+18

°C

Water temperature

air humidity 67%; 3 millimeters of precipitation (1% of annual average); Wind southerly 1.7 Meters per second; Water temperature +18°

Weather graphs for September

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

S

S

SW

SW

S

S

S

SW

SW

SW

S

SW

SW

SW

SW

SW

S

S

S

S

S

S

S

S

S

S

S

S

S

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

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Los Angeles
San Francisco
Sacramento
Oakland
Santa Monica
Beverly Hills
Monterey
San Jose
Santa Barbara

Cities with similar weather in September

Batumi
Lisbon
Heraklion
Nice
Hersonisos
Kobuleti
Kos
Santa Cruz de Tenerife
Funchal

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

In September, the weather in San Luis Obispo is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, San Luis Obispo has 28 sunny and 2 partly cloudy days in September. September as well as May, June, July, and August is considered the most comfortable time to visit San Luis Obispo.

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