San Sebastián weather in December

December in San Sebastián: nice, dry — an excellent time to visit.

#5 of 12 months in San Sebastián · #80 of 604 destinations to visit in December · comfort 85/100 (tier A)

Updated June 2026 · climate normals from ERA5 reanalysis

San Sebastián climate normals — December

Daytime high22°C / 71°F😎 nice
Nighttime low19°C / 67°F
Feels like (high)22°C / 72°F
Rainfall23 mm / 0.9 in☀️ dry
Rainy days4 days
Humidity71%💧 humid
Dew point16°C / 60°F
Sunshine9.4 h/day
Daylight10.4 h
Wind20 km/h / 12 mph
Air quality (US AQI)62🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Where is San Sebastián?

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San Sebastián in December — FAQ

Is December a good time to visit San Sebastián?
December in San Sebastián: nice, dry — an excellent time to visit. It ranks #5 of 12 months for San Sebastián on SeasonMap's comfort score (85/100).
What is the weather like in San Sebastián in December?
In December, San Sebastián averages a daily high of 21.8°C and a low of 19.3°C, with about 22.9 mm of rain over roughly 3.6 rainy days.
What is the air quality in San Sebastián in December?
San Sebastián has a mean US Air Quality Index of about 62 in December.

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