When to go
The Best Time to Visit San Sebastián
Month-by-month climate data for San Sebastián, Spain — daily highs and lows, rain days, and an honest verdict for every month of the year.
Timing is the first real decision when planning San Sebastián— it drives crowds, prices and what's actually open. Here's how the year breaks down so you can pick dates that fit the trip you're building, not just the weather.
May–June, September. Warm without August's Semana Grande crush; September brings the film festival and the year's best sea temperatures.
Warmest in San Sebastián: Aug (25°C / 77°F) · Coolest: Jan (12°C / 54°F) · Wettest: Dec (~17 rain days)
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)
San Sebastián climate, month by month
January
12° / 6°C
~14 rain days
Fair
February
15° / 8°C
~13 rain days
Good
March
16° / 8°C
~16 rain days
Good
April
17° / 10°C
~13 rain days
Good
May
20° / 12°C
~16 rain days
Good
June
22° / 15°C
~16 rain days
Good
July
24° / 17°C
~11 rain days
Excellent
August
25° / 18°C
~13 rain days
Excellent
September
23° / 16°C
~14 rain days
Good
October
21° / 14°C
~14 rain days
Good
November
16° / 10°C
~16 rain days
Good
December
14° / 8°C
~17 rain days
Fair
Plan around it
Dates locked in? Start from the San Sebastián travel guide or jump straight to a 3-day, 5-day or 7-day itinerary.