San Sebastián weather by month & the best time to visit
Spain · seaside town · oceanic / maritime climate
The best time to visit San Sebastián is July — its sunniest month (Sunshine Score 82/100), with August and September close behind. San Sebastián averages about 2,077 hours of sunshine a year. Daytime highs around 23°C / 73°F and roughly 48 mm of rain in July.
When is the best time to visit San Sebastián?
For sunshine, the best time to visit San Sebastián is July, then August and September. The dullest month is January (23/100, 126 mm of rain). The full month-by-month picture is in the table below.
How sunny is San Sebastián?
San Sebastián gets a moderate 2,077 hours of sunshine a year. 59 Sunshine Score points separate July (82) from January (23), so the month you pick matters. It ranks #37 of 40 destinations in Spain for annual sunshine, below the national median of 2,914 hours. The year's 1,070 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 23 | 12° / 54°F | 8° / 46°F | 126 mm | 1 | 14° / 57°F |
| February | 24 | 12° / 54°F | 8° / 46°F | 95 mm | 2 | 14° / 57°F |
| March | 37 | 14° / 57°F | 9° / 48°F | 90 mm | 3 | 14° / 57°F |
| April | 50 | 16° / 61°F | 11° / 52°F | 86 mm | 4 | 15° / 59°F |
| May | 63 | 18° / 64°F | 13° / 55°F | 82 mm | 6 | 17° / 63°F |
| June | 78 | 22° / 72°F | 17° / 63°F | 68 mm | 6 | 20° / 68°F |
| July | 82 | 23° / 73°F | 18° / 64°F | 48 mm | 7 | 22° / 72°F |
| August | 82 | 24° / 75°F | 19° / 66°F | 51 mm | 6 | 23° / 73°F |
| September | 79 | 22° / 72°F | 17° / 63°F | 64 mm | 5 | 21° / 70°F |
| October | 74 | 20° / 68°F | 15° / 59°F | 94 mm | 3 | 19° / 66°F |
| November | 37 | 15° / 59°F | 11° / 52°F | 149 mm | 1 | 17° / 63°F |
| December | 23 | 12° / 54°F | 9° / 48°F | 117 mm | 1 | 15° / 59°F |
Sea temperature in San Sebastián by month
The sea off San Sebastián is warmest in August at around 23°C / 73°F, and coolest in January at 14°C / 57°F. The water sits at a comfortable 21°C or warmer roughly 3 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
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Head-to-head
How San Sebastián compares month by month: San Sebastián vs Bilbao · San Sebastián vs Vitoria-Gasteiz · San Sebastián vs Santander · San Sebastián vs Pau/Pyrénées (Uzein) · all comparisons
San Sebastián: questions and answers
What kind of destination is San Sebastián?
San Sebastián is a seaside town in Spain with a oceanic / maritime climate — the sea reaches 23°C at its warmest and is swimmable (21°C+) about 3 months a year.
How many hours of sunshine does San Sebastián get a year?
San Sebastián gets about 2,077 hours of sunshine a year, at its best around July.
When is the best time to visit San Sebastián?
The sunniest time to visit San Sebastián is July, when the Sunshine Score peaks at 82/100 (with August and September close behind). Expect daytime highs around 23°C / 73°F.
What is the least sunny month in San Sebastián?
January is the least sunny month in San Sebastián, scoring 23/100 with about 126 mm of rain.
What is the sea temperature in San Sebastián?
The sea in San Sebastián ranges from about 14°C (January) to 23°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in San Sebastián?
The typical midday UV index in San Sebastián peaks around 7 (high) in July, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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