Weather in San Sebastian in December

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temperature
Temp

19° C

average

rain
Rain

8 mm

per month

sun
Sun

64 %

chance

humidity
Humidity

55 %

average

Average daily temperatures

It’s pretty mild at this time of year, but it’s a good idea to bring along a jumper or light jacket for the evenings. The average daily maximum is 22 C and the average daily minimum is 16 C.

Sunshine and rainfall

There is a 64% chance of a perfect sunny day and a 36% chance of seeing some clouds, with on average 8mm of rainfall this month.

Best time to be on the beach

It’s a particularly good time of year to swim in the sea, with water temperatures around 21 C.

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