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San Sebastian weather in September

Weather in San Sebastian: September

Average day temperature: 73.7°F
Average night temperature: 59.0°F
Sea water temperature: 70.3°F
Number of sunny days: 15 days
Day length: 11.8 - 13.2 hours
Number of rainy days: 4 days
Precipitation totals: 2.0 in.

Air temperature in September, °F

Show year:
2024
2023
2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
0
12
24
36
48
60
72
84
96
Day temperature   
Night temperature

The highest day temperature during September of 2024 was 75°F. At the same time the lowest night temperature was 46°F. Day and night temperature averages during September were 67.2°F and 55.6°F.

Sea water temperature in San Sebastian in September, °F

Show year:
2024
2023
2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
62
65
68
71
74
77
80

The average sea water temperature in September of 2024 was 69.9°F. The highest and lowest sea temperatures during the month were 73.0°F and 66.6°F.

Sunny, partly cloudy and cloudy days
Sunny days
Partly cloudy days
Cloudy days
45%
28%
28%

Mostly all days in September are sunny but cloudy days are also possible.

Precipitation total in September, in.

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
0.9
1.8
2.7
3.6
4.5
5.4
6.4
7.3
4.3
5.3
3.0
1.8
1.7
3.0
2.7
2.9
3.5
3.9
4.8
4.3
5.3
3.0
2.1
1.8
1.7
3.0
2.7
2.9
3.5
3.9
4.8

Precipitation total value in San Sebastian in September is 2.1 in. Other months of the year show relatively similar values.

Wind speed in September, mph
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
1.4
2.8
4.2
5.5
6.9
8.3
9.7
7.5
7.6
6.3
5.2
5.2
5.3
6.1
7.0
8.1
7.6
7.7
7.5
7.6
6.3
5.7
5.2
5.2
5.3
6.1
7.0
8.1
7.6
7.7

The average wind speed value in September is 5.7 mph It makes September one of the least windy months of the year.

Average sunny hours
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
1.4
2.8
4.2
5.6
7.1
8.5
9.9
4.4
4.1
6.6
7.7
8.2
7.0
7.1
6.7
5.6
5.3
4.4
4.4
4.1
6.6
7.1
7.7
8.2
7.0
7.1
6.7
5.6
5.3
4.4

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.1.

Best time for vacation in San Sebastian

Sunniest months:
August 16 days
September 15 days
October 14 days
Warmest months:
August 76.7 °F
July 74.8 °F
September 73.7 °F
Warmest sea temp:
August 72.6 °F
July 71.1 °F
September 70.3 °F
Coldest months:
January 51.6 °F
February 53.2 °F
December 54.7 °F
Rainiest months:
November 9 days
February 8 days
January 8 days
Windiest months:
February 8.9 mph
December 8.8 mph
November 8.7 mph

San Sebastian on a weather map

Leaflet | Tiles © Esri
Places in Spain:
Name
°F
+61°F
+57°F
+61°F
+64°F
+61°F
+68°F
+57°F
+64°F
+57°F
+64°F
+63°F
+59°F
+66°F
24 Hours Forecast
San Sebastian
Local time: 13:45
February 22, saturday
1500
55°F
SE
7 mph
1800
52°F
SE
4 mph
2100
48°F
NE
3 mph
February 23, sunday
0000
46°F
NE
3 mph
0300
46°F
NE
3 mph
0600
45°F
N
3 mph
0900
48°F
N
3 mph
1200
57°F
W
3 mph
Units of measurement: °C / °F