San Sebastián Weather in December
December in San Sebastián brings moderate temperatures around 13°C (55°F) during the day, dropping to 8°C (46°F) at night, with quite a bit of rainfall expected, averaging around 150 mm (5.9 in) for the month.
Rainfall in San Sebastián in December
Looking at the last 30 years, the data shows about 18 days with rain, averaging 150 mm (5.9 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in San Sebastián in December
Daytime temperatures in San Sebastián reach 13°C (55°F) in December, dropping to 8°C (46°F) at night. December marks the winter season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in San Sebastián in December
The month is characterized by fewer sunny days, with roughly 80 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit San Sebastián. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
San Sebastián Temperature in December
Min Temperature
8°C (46°F)
Max Temperature
13°C (55°F)
Chance of Rain
59%
Precipitation
150 mm (5.9 in)
Rainy days
18 days
Humidity
75%
Sunshine
80 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Sebastián typically stay consistent throughout December, with daily highs averaging around 13°C (55°F). Nights are cold, with lows around 6°C (43°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for San Sebastián in December
Browse day-by-day weather records for San Sebastián spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Sebastián historical weather extremes in December
Based on 49 years of weather observations in San Sebastián between 1976 and 2025, these are the recorded extremes.
- San Sebastián recorded its highest December temperature of 24°C (75°F) on December 2, 1985.
- The coldest December day was on December 1, 1980, with a maximum of 2°C (36°F).
- The lowest overnight temperature recorded in December was -8°C (18°F) (December 25, 2001).
- The wettest December day on record brought 102 mm (4 in) of precipitation to San Sebastián (December 6, 2006).
Best Places in Spain in December
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Sebastián in December
The weather can be unpredictable in December, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in San Sebastián in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Sebastián climate overview or explore weather in Spain.
