Click on a day for an hourly weather forecast
The weather in San Sebastian in August 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 August 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 August 2025.
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 18° | 1 | 30 | 0 | 16 mm | Good | San Sebastian in January |
| February | 19° / 18° | 1 | 27 | 0 | 17 mm | Good | San Sebastian in February |
| March | 19° / 18° | 0 | 31 | 0 | 9 mm | Good | San Sebastian in March |
| April | 20° / 18° | 0 | 30 | 0 | 8 mm | Good | San Sebastian in April |
| May | 21° / 19° | 0 | 31 | 0 | 1 mm | Good | San Sebastian in May |
| June | 22° / 21° | 0 | 30 | 0 | 1 mm | Good | San Sebastian in June |
| July | 24° / 22° | 0 | 31 | 0 | 0 mm | Perfect | San Sebastian in July |
| August | 25° / 23° | 0 | 31 | 0 | 5 mm | Perfect | San Sebastian in August |
| September | 25° / 23° | 0 | 30 | 0 | 7 mm | Perfect | San Sebastian in September |
| October | 24° / 23° | 1 | 30 | 0 | 22 mm | Perfect | San Sebastian in October |
| November | 22° / 21° | 1 | 29 | 0 | 25 mm | Good | San Sebastian in November |
| December | 21° / 20° | 1 | 30 | 0 | 23 mm | Good | San Sebastian in December |