Annual mean 23°C · wettest around September · prevailing wind SW
Warmest
31.2 °C
Coldest
27.0 °C
Wettest
98%
Windiest
4.4 m/s
Prevailing
SW
3.6 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
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 23°C. April is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 16°C. The rainy (wet) season in San Sebastián runs from May to November, peaking in September with a 83% chance of rain on a given day. The dry season is December to April; December is the driest month, at 20%. Winds in San Sebastián are highest in February, averaging 2.5 m/s (9 km/h), and lightest in June, at 1.7 m/s (6 km/h). The prevailing wind is from the SW. The clearest skies in San Sebastián come in February, when the sky is typically 40% covered; June is the cloudiest month, at 77%.
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
28°C
17°C
28°C
36%
44%
2.2 m/s
25
32
28
February
29°C
16°C
28°C
39%
40%
2.5 m/s
22
31
27
March
30°C
19°C
31°C
38%
45%
2.1 m/s
23
26
19
April
31°C
20°C
32°C
49%
53%
1.9 m/s
23
17
17
May
30°C
20°C
32°C
64%
70%
1.8 m/s
24
18
17
June
28°C
20°C
30°C
81%
77%
1.7 m/s
29
23
22
July
27°C
19°C
29°C
79%
70%
2.0 m/s
32
13
33
August
28°C
19°C
30°C
82%
72%
1.8 m/s
30
16
25
September
28°C
19°C
29°C
83%
74%
1.8 m/s
32
17
28
October
28°C
18°C
30°C
81%
70%
1.9 m/s
28
15
27
November
28°C
19°C
29°C
55%
56%
2.1 m/s
27
19
28
December
28°C
17°C
28°C
20%
45%
2.1 m/s
23
29
26
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 27°C at their warmest in July, its coolest month, and 31°C in April, its warmest; the coolest hours of the day run from 16°C to 20°C through the year, and the average temperature over the year is 23°C around the clock. Rain is most likely around September and least likely around December. 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 28°CLow 17°CRain 32%
Winter in San Sebastián has typical daily highs of about 28°C and lows of about 17°C, with a 32% chance of rain on a given day.
San Sebastián weather in springMarch to May
High 30°CLow 20°CRain 51%
Spring in San Sebastián has typical daily highs of about 30°C and lows of about 20°C, with a 51% chance of rain on a given day.
San Sebastián weather in summerJune to August
High 28°CLow 19°CRain 81%
Summer in San Sebastián has typical daily highs of about 28°C and lows of about 19°C, with a 81% chance of rain on a given day.
San Sebastián weather in autumnSeptember to November
High 28°CLow 19°CRain 73%
Autumn in San Sebastián has typical daily highs of about 28°C and lows of about 19°C, with a 73% chance of rain on a given day.
When is the rainy season in San Sebastián?
The rainy (wet) season in San Sebastián runs from May to November, peaking in September with a 83% chance of rain on a given day. The dry season is December to April; December is the driest month, at 20%.
What time of year is San Sebastián windiest?
Winds in San Sebastián are highest in February, averaging 2.5 m/s (9 km/h), and lightest in June, at 1.7 m/s (6 km/h). The prevailing wind is from the SW.
What is the average temperature in San Sebastián year round?
The average temperature in San Sebastián over the whole year is 23°C. April is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 16°C.