Spain
San Sebastian in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Sebastian in December is climatically mixed. The average daily high is around 12 °C, and the sea is about 14 °C. With about 14 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
28/100 · #11
Warmth
#10
Dryness
#11
Sun
#12
Sea warmth
#8
Published best categories: none
San Sebastian · DecemberPhoto: Ander.gd · CC BY-SA 4.0Climate facts
- Average high
- 12 °C
- Average low
- 8 °C
- Sea
- 14 °C
- Rainy days (est.)
- 14 rainy days (est.)
- Sun (est.)
- 2 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 14 | 11 | 16 | 149 | 2.1 | 81 | 3.6 | 16 | 33 |
| December (selected) | 12 | 8 | 14 | 118 | 1.6 | 82 | 3.7 | 14 | 28 |
| January | 11 | 7 | 14 | 113 | 1.9 | 82 | 3.7 | 13 | 26 |
How do the previous and next months compare?
Baseline: December (28/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | +5 | +2.3 °C | +2.3 °C | +1.3 | +31.1 mm | +0.5 h | -1.3 % | -0.1 m/s | +2 °C |
| January | -2 | -1 °C | -1.1 °C | ±0 | -4.4 mm | +0.3 h | -0.2 % | -0.1 m/s | -1.3 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is San Sebastian in December?
The average daily high is around 12 °C, with an average daily low of about 8 °C.
Can you swim in San Sebastian in December?
The sea is about 14 °C (cold).
Does it rain a lot in San Sebastian in December?
The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 118 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Sebastian?
By the climate score, June, July, August and September are the strongest months for San Sebastian. For a beach trip: June, July, August and September. December is not among them.