Annual mean 19°C · wettest around March · prevailing wind NW
Warmest
24.2 °C
Coldest
22.1 °C
Wettest
20%
Windiest
3.5 m/s
Prevailing
NW
2.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in San Sebastián over the whole year is 19°C. September is the hottest month, with highs of about 24°C; July is the coldest, with lows of about 16°C. The rainy (wet) season in San Sebastián runs from March to May, peaking in March with a 31% chance of rain on a given day. The dry season is June to October; August is the driest month, at 7%. Winds in San Sebastián are highest in July, averaging 2.1 m/s (8 km/h), and lightest in November, at 1.4 m/s (5 km/h). The prevailing wind is from the NW. The clearest skies in San Sebastián come in September, when the sky is typically 63% covered; March is the cloudiest month, at 78%.
Month by month San Sebastián climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
23°C
16°C
23°C
18%
72%
1.7 m/s
64
20
53
February
23°C
16°C
23°C
18%
75%
1.6 m/s
63
21
52
March
22°C
16°C
23°C
31%
78%
1.5 m/s
63
20
52
April
23°C
16°C
23°C
27%
75%
1.6 m/s
63
25
48
May
23°C
17°C
23°C
22%
75%
1.6 m/s
63
26
47
June
22°C
16°C
22°C
13%
73%
1.7 m/s
61
23
52
July
23°C
16°C
22°C
11%
70%
2.1 m/s
61
25
51
August
24°C
16°C
23°C
7%
66%
2.1 m/s
59
23
50
September
24°C
16°C
23°C
10%
63%
2.1 m/s
58
25
47
October
23°C
16°C
24°C
18%
70%
1.6 m/s
63
23
48
November
23°C
16°C
23°C
20%
71%
1.4 m/s
65
18
55
December
23°C
16°C
23°C
16%
73%
1.5 m/s
63
20
53
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short San Sebastián weather by season
Year round, San Sebastián has days of about 22°C at their warmest in March, its coolest month, and 24°C in September, its warmest; the coolest hours of the day run from 16°C to 17°C through the year, and the average temperature over the year is 19°C around the clock. Rain is most likely around March and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
San Sebastián weather in winterDecember to February
High 23°CLow 16°CRain 17%
Winter in San Sebastián has typical daily highs of about 23°C and lows of about 16°C, with a 17% chance of rain on a given day.
San Sebastián weather in springMarch to May
High 22°CLow 16°CRain 27%
Spring in San Sebastián has typical daily highs of about 22°C and lows of about 16°C, with a 27% chance of rain on a given day.
San Sebastián weather in summerJune to August
High 23°CLow 16°CRain 10%
Summer in San Sebastián has typical daily highs of about 23°C and lows of about 16°C, with a 10% chance of rain on a given day.
San Sebastián weather in autumnSeptember to November
High 23°CLow 16°CRain 16%
Autumn in San Sebastián has typical daily highs of about 23°C and lows of about 16°C, with a 16% chance of rain on a given day.
When is the rainy season in San Sebastián?
The rainy (wet) season in San Sebastián runs from March to May, peaking in March with a 31% chance of rain on a given day. The dry season is June to October; August is the driest month, at 7%.
What time of year is San Sebastián windiest?
Winds in San Sebastián are highest in July, averaging 2.1 m/s (8 km/h), and lightest in November, at 1.4 m/s (5 km/h). The prevailing wind is from the NW.
What is the average temperature in San Sebastián year round?
The average temperature in San Sebastián over the whole year is 19°C. September is the hottest month, with highs of about 24°C; July is the coldest, with lows of about 16°C.