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Weather in San Sebastian in September

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temperature
Temp

23° C

average

rain
Rain

2 mm

per month

sun
Sun

79 %

chance

humidity
Humidity

69 %

average

Average daily temperatures

Days are usually hot with balmy evenings, so visitors should pack light and cool clothing. The average daily maximum is 27 C and the average daily minimum is 20 C.

Sunshine and rainfall

There is a 79% chance of a perfect sunny day and a 21% chance of seeing some clouds, with on average 2mm of rainfall this month.

Best time to be on the beach

It’s a great time of year to swim in the sea, with the water at an average temperature of 24 C.