Weather in Donostia / San Sebastian in September
How warm is it in Donostia / San Sebastian in September?
In September the typical daytime high in Donostia / San Sebastian is 21.5 °C on average, from 22.5 °C at the start to 20.1 °C at the end of the month.
That is 1.4 °C cooler than in August and 2.6 °C warmer than in October.
The last 10 years were 0.8 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
Measured at the weather station San Sebastian - Igueldo, 5 km away.