Verdict: Good month
San Sebastián Weather in May
May hits the sweet spot in San Sebastián — highs around 20°C (68°F), ideal for a full day on foot. It's also the wet side of the calendar: rain falls on about 16 days, so build flexibility into plans. Overall, May is a solid month to visit San Sebastián.
Average high
20°C / 68°F
Average low
12°C / 54°F
Rain days
~16
Precipitation
120 mm
What to pack for San Sebastián in May
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 16 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
May against the rest of the year
Warmest in San Sebastián: Aug (25°C / 77°F) · Coolest: Jan (12°C / 54°F) · Wettest: Dec (~17 rain days)
12°
6°
Jan
15°
8°
Feb
16°
8°
Mar
17°
10°
Apr
20°
12°
May
22°
15°
Jun
24°
17°
Jul
25°
18°
Aug
23°
16°
Sep
21°
14°
Oct
16°
10°
Nov
14°
8°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)