The maximum temperature in San Sebastian is on average 29°C over the year, with values generally ranging between 27°C in January and 30°C in September. Precipitation is fairly high, with about 1,694 mm per year. It ranges from 50 mm in January to 244 mm in September.
The weather is pleasant to stay to San Sebastian in: January, February, March, April and December. However, the period when the weather is truly ideal is January, February and December.
For swimming, the most favorable period for water temperature is July, August, September, October and November, with a water temperature above 28.4°C.
However, the best time to fully enjoy the beach and swimming is January, February, March, April, November and December.
Water sports are particularly favorable in: January, February, March, April, November and December. For scuba diving and snorkeling, the best months are January, February, March, April, November and December.
In terms of crowd levels, the quietest periods are in October, while crowding is high in January, February, December and July.
