Weather in San Sebastian in September 2024
Average weather
Average temperature in San Sebastian in September
Going from a maximum of +95°F during the day to a minimum of +52°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes down 29% by the end of the month, compared with the beginning of the month, from +79°F to +66°F.
Is San Sebastian warm or cold in September?
San Sebastian is typically warm in September.
Maximum temperatures go down compared to the previous month from +75°F to +73°F. The minimum temperature also goes down from +64°F to +61°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in San Sebastian, here is the comparison with other months:
Climate in San Sebastian in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +75°F | +73°F | +68°F | ||||
| Min. temperature | ||||||
| +54°F | +45°F | +36°F | ||||
| Max. temperature | ||||||
| +102°F | +99°F | +88°F | ||||
| Rainfall | ||||||
| 100 mm | 107 mm | 143 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 2 m/s | ||||
| Humidity | ||||||
| 80% | 78% | 76% | ||||
| Air pressure | ||||||
| 1016 HPa | 1016 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 5 | 7 | 7 | ||||
| Cloudy days | ||||||
| 16 | 14 | 13 | ||||
| Rainy days | ||||||
| 10 | 9 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +75°F in the day, the average maximum temperature lowers to +73°F. Prepare for more rain. Average rainfall goes from 100 mm to 107 mm. It feels drier, as humidity decreases from 80% to 78%. The average wind speed doesn’t change much during September, staying around 1 m/s. The good news is there are likely to be more sunny days in September, from 5 to 7.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Sebastian is gradually increasing during September, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in San Sebastian?
Climate Change Over the Years
The climate in San Sebastian in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1994 (+71°F) and the highest in 2016 (+81°F). The driest year was 1985 with only 5 mm of rainfall, and the wettest year was 2020 with 430 mm.
FAQ
Is September a good time to visit San Sebastian?
Can you sunbathe in San Sebastian in September?
Is San Sebastian rainy in September?
Is it sunny in San Sebastian in September?
Other cities in Spain
Monthly weather in San Sebastian
Source of the data
For this page, we’ve looked at the typical weather in San Sebastian, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.