September remains warm at 23C (73F) but rain increases to 120mm. November is the wettest month at 169mm across 15 rain days, with temperatures dropping to 8-16C (46-61F). The famous txuleta (steak) and cider house season begins, providing indoor alternatives to the beach.
Winter Weather in San Sebastian (December to February)
Winters are mild but wet. December-February see highs of 13-14C (55-57F), lows of 5-6C (41-43F), and 13-15 rain days per month. It rarely freezes. Snow is extremely rare in the city. Sunshine drops to 2-4 hours daily.
July and August are the driest and sunniest months with 7 hours of daily sun, highs of 24-25C (75-77F), and rain dropping to 85-97mm across 10-11 days. Sea temperature peaks at 22C (71F) in August — swimmable but not warm. This is peak tourist season for the city’s beaches.
Autumn Weather in San Sebastian (September to November)
September remains warm at 23C (73F) but rain increases to 120mm. November is the wettest month at 169mm across 15 rain days, with temperatures dropping to 8-16C (46-61F). The famous txuleta (steak) and cider house season begins, providing indoor alternatives to the beach.
Winter Weather in San Sebastian (December to February)
Winters are mild but wet. December-February see highs of 13-14C (55-57F), lows of 5-6C (41-43F), and 13-15 rain days per month. It rarely freezes. Snow is extremely rare in the city. Sunshine drops to 2-4 hours daily.
March starts cool with highs of 16C (61F) and 13 rain days. May warms to 20C (68F) with improving sunshine (6 hours) and decreasing rain to 112mm. The sea is still cold at 14-16C (57-61F).
Summer Weather in San Sebastian (June to August)
July and August are the driest and sunniest months with 7 hours of daily sun, highs of 24-25C (75-77F), and rain dropping to 85-97mm across 10-11 days. Sea temperature peaks at 22C (71F) in August — swimmable but not warm. This is peak tourist season for the city’s beaches.
Autumn Weather in San Sebastian (September to November)
September remains warm at 23C (73F) but rain increases to 120mm. November is the wettest month at 169mm across 15 rain days, with temperatures dropping to 8-16C (46-61F). The famous txuleta (steak) and cider house season begins, providing indoor alternatives to the beach.
Winter Weather in San Sebastian (December to February)
Winters are mild but wet. December-February see highs of 13-14C (55-57F), lows of 5-6C (41-43F), and 13-15 rain days per month. It rarely freezes. Snow is extremely rare in the city. Sunshine drops to 2-4 hours daily.
San Sebastian has an oceanic climate (Koppen Cfb) with warm summers, mild winters, and rainfall distributed throughout the year — it’s one of Europe’s rainiest cities with 1,500mm annual precipitation spread across roughly 180 rain days. The city sits in a bay on Spain’s northern Basque coast, protected by Mount Urgull and Mount Igueldo, which moderate wind but not rain. Sea temperature ranges from 12C (54F) in February to 22C (71F) in August.
Monthly Temperature and Rainfall in San Sebastian
| Month | Avg High | Avg Low | Rain (mm) | Rain Days | Sea Temp | Sun Hours |
|---|---|---|---|---|---|---|
| Jan | 13°C (55°F) | 5°C (41°F) | 149 | 15 | 13°C (55°F) | 3 |
| Feb | 14°C (57°F) | 5°C (41°F) | 119 | 13 | 12°C (54°F) | 4 |
| Mar | 16°C (61°F) | 7°C (45°F) | 116 | 13 | 12°C (54°F) | 5 |
| Apr | 17°C (63°F) | 8°C (46°F) | 138 | 15 | 14°C (57°F) | 5 |
| May | 20°C (68°F) | 11°C (52°F) | 112 | 13 | 16°C (61°F) | 6 |
| Jun | 22°C (72°F) | 14°C (57°F) | 89 | 11 | 19°C (66°F) | 7 |
| Jul | 24°C (75°F) | 16°C (61°F) | 85 | 10 | 21°C (70°F) | 7 |
| Aug | 25°C (77°F) | 17°C (63°F) | 97 | 11 | 22°C (71°F) | 7 |
| Sep | 23°C (73°F) | 15°C (59°F) | 120 | 12 | 21°C (70°F) | 6 |
| Oct | 20°C (68°F) | 12°C (54°F) | 149 | 14 | 18°C (64°F) | 4 |
| Nov | 16°C (61°F) | 8°C (46°F) | 169 | 15 | 16°C (61°F) | 3 |
| Dec | 13°C (55°F) | 6°C (43°F) | 151 | 15 | 14°C (57°F) | 2 |
San Sebastian Weather by Season
Spring Weather in San Sebastian (March to May)
March starts cool with highs of 16C (61F) and 13 rain days. May warms to 20C (68F) with improving sunshine (6 hours) and decreasing rain to 112mm. The sea is still cold at 14-16C (57-61F).
Summer Weather in San Sebastian (June to August)
July and August are the driest and sunniest months with 7 hours of daily sun, highs of 24-25C (75-77F), and rain dropping to 85-97mm across 10-11 days. Sea temperature peaks at 22C (71F) in August — swimmable but not warm. This is peak tourist season for the city’s beaches.
Autumn Weather in San Sebastian (September to November)
September remains warm at 23C (73F) but rain increases to 120mm. November is the wettest month at 169mm across 15 rain days, with temperatures dropping to 8-16C (46-61F). The famous txuleta (steak) and cider house season begins, providing indoor alternatives to the beach.
Winter Weather in San Sebastian (December to February)
Winters are mild but wet. December-February see highs of 13-14C (55-57F), lows of 5-6C (41-43F), and 13-15 rain days per month. It rarely freezes. Snow is extremely rare in the city. Sunshine drops to 2-4 hours daily.
