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 high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 23 mm / 0.9 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 9.4 h/day | |
| Daylight | 10.4 h | |
| Wind | 20 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?
Loading map…
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.