Santiago de Compostela is typically warm in September.

Maximum temperatures go down compared to the previous month from +24°C to +23°C. The minimum temperature also goes down from +15°C to +14°C.

It’s generally warm, but pack a long-sleeve shirt for evenings.

September is one of the warmest months in Santiago de Compostela, here is the comparison with other months:

September typically has worse weather conditions compared to August. It’s getting colder in September. From +24°C in the day, the average maximum temperature lowers to +23°C. Prepare for more rain. Average rainfall goes from 41 mm to 79 mm. Humidity rises from 77% to 79%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 9 sunny days during the month.

October brings much the same weather, it remains ok.

The climate in Santiago de Compostela in September has not changed much over the last 43 years.

The average temperature was the lowest in 1986 (+17°C) and the highest in 2017 (+19°C). The driest year was 2004 with only 848 mm of rainfall, and the wettest year was 2024 with 2256 mm.

For this page, we’ve looked at the typical weather in Santiago de Compostela, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

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.