Measurements:
°C
°F
CURRENT WEATHER
22:16
San Sebastian
66°F
E 2 mph
Feels like: 66°F
Precip: 51%
World Resorts Spain San Sebastian Weather

7 Day Weather Forecast

09.08
tue
DAY
76°F
SE 4 mph
precip
4%
NIGHT
64°F
SE 7 mph
precip
89%
09.09
wed
DAY
62°F
S 6 mph
precip
48%
NIGHT
56°F
S 3 mph
precip
28%
09.10
thu
DAY
68°F
SE 5 mph
precip
14%
NIGHT
52°F
N 4 mph
precip
17%
09.11
fri
DAY
72°F
S 4 mph
precip
2%
NIGHT
54°F
N 4 mph
precip
20%
09.12
sat
DAY
70°F
S 5 mph
precip
3%
NIGHT
58°F
N 3 mph
precip
42%
09.13
sun
DAY
76°F
S 4 mph
precip
3%
NIGHT
62°F
N 3 mph
precip
16%
09.14
mon
DAY
80°F
S 4 mph
precip
1%
NIGHT
68°F
N 4 mph
precip
5%

San Sebastian Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for San Sebastian was 21.2°F. The maximum and minimum values were 20.1°F and 22.2°F respectively.

San Sebastian on the Weather Map

Best Time to Visit San Sebastian
The most sunny months:
August 15 days
September 15 days
October 14 days
The most warm months:
August 79.8 °F
July 77.7 °F
September 76.1 °F
Warmest sea temperature:
August 75.3 °F
July 73.9 °F
September 72.6 °F
The most cold months:
January 51.6 °F
February 54.0 °F
December 55.1 °F
The most rainy months:
November 9 days
January 8 days
February 7 days
The most windy months:
February 9 mph
November 8 mph
January 8 mph
more details