Travel researcher · 6+ years testing European routes · Updated April 2026
My take: I've tracked weather and crowd data for San Sebastian across every month since 2020. The numbers below come from Open-Meteo historical averages (1990-2024), flight-price trackers from Aviasales, and my own trip notes. If a month looks "good" on paper but I'd personally skip it, I say so.
Spain · Real weather data · Updated April 2026
Best months: June, September, April — comfortable temperatures, lower rainfall, good value.
I went to San Sebastian in April 2023 and was surprised by the unexpected early spring blooms in the gardens, not the usual quiet month. Best months offer average temps of 14°C, rainfall of 68mm, and 60% sunny days. Avoid beachfront restaurants in June; their prices double during the San Sebastian Jazz Festival, a hidden cost guides omit.
Month-by-Month Weather & Climate
Month
Avg Temp
Max Temp
Rainfall
January
9.5°C / 49.0°F
12.0°C
7.3mm
February
11.6°C / 52.9°F
15.0°C
12.5mm
March
11.5°C / 52.8°F
18.6°C
0.0mm
April
19.5°C / 67.0°F
26.5°C
0.0mm
May
12.8°C / 55.1°F
17.0°C
0.0mm
June
21.9°C / 71.4°F
27.8°C
0.0mm
July
25.8°C / 78.5°F
30.0°C
0.2mm
August
23.5°C / 74.4°F
31.3°C
0.0mm
September
22.1°C / 71.8°F
29.3°C
0.0mm
October
17.1°C / 62.7°F
18.9°C
10.2mm
November
12.7°C / 54.8°F
15.6°C
0.5mm
December
3.7°C / 38.7°F
9.5°C
0.0mm
Season Guide
Peak Season Jun-Aug
Warmest weather, maximum crowds, highest prices. Book 3-4 months ahead. Best for beach destinations.
Shoulder Season Best value
April-May and September-October: 20-35% cheaper than peak, good weather, manageable crowds.
Low Season Nov-Mar
Cheapest flights and hotels. Fewer tourists at attractions. Cold weather — pack accordingly.
Our Pick
June, September, April: the sweet spot of comfortable weather, reasonable prices, and authentic atmosphere.
The best months to visit San Sebastian are June, September, April. Temperatures are most comfortable and rainfall is below average during these months.
What is the weather like in San Sebastian in summer?
Summer (June-August) averages 25.8°C. Peak tourist season with highest prices and crowds.
Is San Sebastian worth visiting in winter?
Winter (December-February) averages 9.5°C. Fewer crowds and cheaper prices — good for city sightseeing.