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September weather forecast in San Sebastian

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

	764 mmHg		75%
	6.5 m/s		+23

31 August, Sunday. day, 21°; night, 19°; clear

1 September, mon

	764 mmHg		77%
	6.3 m/s		+22

1 September, Monday. day, 21°; night, 19°; partly cloudy

2 September, tue

	764 mmHg		75%
	6.1 m/s		+22

2 September, Tuesday. day, 21°; night, 19°; partly cloudy

3 September, wed

	763 mmHg		76%
	6 m/s		+22

3 September, Wednesday. day, 21°; night, 19°; clear

4 September, thu

	763 mmHg		79%
	6.2 m/s		+23

4 September, Thursday. day, 21°; night, 19°; rain

5 September, fri

	763 mmHg		77%
	6.4 m/s		+24

5 September, Friday. day, 21°; night, 19°; clear

6 September, sat

	763 mmHg		76%
	6 m/s		+22

6 September, Saturday. day, 21°; night, 19°; clear

7 September, sun

	763 mmHg		76%
	6.4 m/s		+23

7 September, Sunday. day, 21°; night, 19°; rain

8 September, mon

	763 mmHg		77%
	6.6 m/s		+23

8 September, Monday. day, 21°; night, 19°; clear

9 September, tue

	763 mmHg		78%
	7.3 m/s		+23

9 September, Tuesday. day, 21°; night, 19°; rain

10 September, wed

	763 mmHg		78%
	6.2 m/s		+24

10 September, Wednesday. day, 21°; night, 19°; clear

11 September, thu

	763 mmHg		81%
	6.9 m/s		+22

11 September, Thursday. day, 21°; night, 19°; partly cloudy

12 September, fri

	763 mmHg		79%
	6.2 m/s		+21

12 September, Friday. day, 20°; night, 19°; rain

13 September, sat

	763 mmHg		78%
	7.2 m/s		+21

13 September, Saturday. day, 20°; night, 18°; rain

14 September, sun

	764 mmHg		73%
	7.2 m/s		+21

14 September, Sunday. day, 20°; night, 18°; rain

15 September, mon

	763 mmHg		75%
	6.3 m/s		+20

15 September, Monday. day, 20°; night, 18°; clear

16 September, tue

	762 mmHg		76%
	6.8 m/s		+21

16 September, Tuesday. day, 21°; night, 18°; rain

17 September, wed

	762 mmHg		74%
	7.1 m/s		+20

17 September, Wednesday. day, 20°; night, 18°; rain

18 September, thu

	762 mmHg		74%
	6.9 m/s		+20

18 September, Thursday. day, 20°; night, 18°; partly cloudy

19 September, fri

	763 mmHg		72%
	7 m/s		+21

19 September, Friday. day, 20°; night, 18°; rain

20 September, sat

	763 mmHg		75%
	6.5 m/s		+21

20 September, Saturday. day, 20°; night, 18°; clear

21 September, sun

	762 mmHg		77%
	6.4 m/s		+22

21 September, Sunday. day, 20°; night, 18°; rain

22 September, mon

	763 mmHg		79%
	6.4 m/s		+22

22 September, Monday. day, 20°; night, 18°; rain

23 September, tue

	762 mmHg		76%
	6.4 m/s		+20

23 September, Tuesday. day, 20°; night, 18°; overcast

24 September, wed

	763 mmHg		75%
	7.7 m/s		+20

24 September, Wednesday. day, 19°; night, 18°; rain

25 September, thu

	764 mmHg		76%
	7.5 m/s		+20

25 September, Thursday. day, 19°; night, 17°; rain

26 September, fri

	764 mmHg		73%
	6.6 m/s		+21

26 September, Friday. day, 19°; night, 17°; clear

27 September, sat

	764 mmHg		74%
	6.7 m/s		+21

27 September, Saturday. day, 20°; night, 18°; partly cloudy

28 September, sun

	764 mmHg		77%
	6.3 m/s		+22

28 September, Sunday. day, 20°; night, 18°; partly cloudy

29 September, mon

	763 mmHg		77%
	6.3 m/s		+21

29 September, Monday. day, 20°; night, 18°; clear

30 September, tue

	763 mmHg		77%
	6.6 m/s		+20

30 September, Tuesday. day, 20°; night, 18°; overcast

1 October, wed

	763 mmHg		78%
	7.8 m/s		+20

1 October, Wednesday. day, 20°; night, 18°; rain

2 October, thu

	763 mmHg		77%
	7.7 m/s		+20

2 October, Thursday. day, 19°; night, 17°; partly cloudy

3 October, fri

	764 mmHg		77%
	7.2 m/s		+20

3 October, Friday. day, 18°; night, 17°; rain

4 October, sat

	764 mmHg		78%
	7 m/s		+21

4 October, Saturday. day, 19°; night, 17°; rain

Average data for 10 years

San Sebastian September

9

sunny days

13

days with precipitation

5

cloudy days

9 sunny days; 13 days with precipitation; 5 cloudy days;

76

%

air humidity

4.3

m/s

WindS

98

mm of precipitation

(7% of annual average)

+22

°C

Water temperature

air humidity 76%; 98 millimeters of precipitation (7% of annual average); Wind southerly 4.3 Meters per second; Water temperature +22°

Weather graphs for September

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

S

S

SW

S

S

S

S

S

SW

S

S

SW

SW

S

S

S

S

S

S

S

S

S

S

SW

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

Madrid
Bilbao
Bordeaux
Toulouse
Oviedo
Zaragoza
Salou
Xixón
Burgos

Cities with similar weather in September

San Francisco
Podgorica
Toronto
Genoa
Boston
Seattle
Lima
San Jose
Durban

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

In September, the weather in San Sebastian is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, San Sebastian has 13 rainy, 9 sunny, 6 partly cloudy, and 2 cloudy days in September. The rains are usually heavy.

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