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San Sebastian Weather in December
December in San Sebastian averages 29°C (84°F) during the day and 23°C (73°F) at night. The excellent conditions and moderate rainfall make it a solid month to visit.
Rainfall in San Sebastian in December
Historically, the month has about 20 days of rain, averaging 40 mm (1.6 in) in total. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in San Sebastian in December
San Sebastian in December has excellent weather. Days reach 29°C (84°F) and nights cool to 23°C (73°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 23°C (73°F), evenings stay pleasantly warm.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April and December typically offer the best weather for San Sebastian.
San Sebastian Temperature in December
Min Temperature
23°C (73°F)
Max Temperature
29°C (84°F)
Chance of Rain
66%
Precipitation
40 mm (1.6 in)
Rainy days
20 days
San Sebastian Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Sebastian - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Sebastian typically stay consistent throughout December, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 21°C (70°F).
Average temperatures in December
Historical weather records for San Sebastian in December
Browse day-by-day weather records for San Sebastian spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Sebastian historical weather extremes in December
Based on 28 years of weather observations (1997-2025), these are the most extreme conditions recorded in San Sebastian.
- The hottest December day on record in San Sebastian reached 34°C (93°F) (December 24, 2002).
- The lowest daytime temperature in December was 23°C (73°F), recorded on December 20, 2011.
- The lowest overnight temperature recorded in December was 16°C (61°F) (December 18, 2008).
Best Places in Puerto Rico in December
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in San Sebastian in December
Warm but pleasant conditions in San Sebastian in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Light rain is possible, so consider bringing a small umbrella or rain jacket.
What To Do in San Sebastian in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling8/10 -
Walking8/10 -
Camping10/10 -
Outdoor sports8/10
San Sebastian 3-Day Forecast
More climate data for San Sebastian
See the full San Sebastian climate overview or explore weather in Puerto Rico.
Popular in December
Where to go in December - average daytime high across popular destinations.
Rio Grande
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