The weather in San Sebastian in September is very hot. The average temperatures are between 23°C and 25°C, drinking water regularly is advisable.
As it is almost never rain during September in San Sebastian the weather is perfect for hanging out outside and exploring all that San Sebastian has to offer.
Our weather forecast can give you a great sense of what weather to expect in San Sebastian in September 2024.
If you’re planning to visit San Sebastian in the near future, we highly recommend that you review the 14 day weather forecast for San Sebastian before you arrive.