Cool
Average highs are around 12°C, so pack for cooler days.
December verdict
San Sebastian, Spain in December
Weather score14Poor
Poor for holiday weather
Average highs are around 12°C, so pack for cooler days. Sunshine averages 2.7h per day, so this is not one of the brighter months. Rainfall averages 133mm, so some wet days are possible.
December weather
Monthly averages
Temp
12°C
Rain
133mm
Sun
2.7h
Sea
14°C
Weather score
14
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 133mm, so some wet days are possible.
Limited sun
Sunshine averages 2.7h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 14°C, so the water can feel cool.
Map
Weather map
Compare San Sebastian, Spain with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December12°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December133mm average rain
December is wetter than San Sebastian's yearly average, so flexible plans matter more.
Driest monthsJune to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December2.7 hours average sun
December is one of San Sebastian's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December14°C average sea
December is below San Sebastian's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
December14 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
