Weather in Santiago de Compostela in September 2025
Average weather
Average temperature in Santiago de Compostela in September
Going from a maximum of +31°C during the day to a minimum of +11°C during the night, the temperature in September averages around +23°C.
The average maximum temperature goes up 50% by the end of the month, compared with the beginning of the month, from +21°C to +31°C.
Is Santiago de Compostela warm or cold in September?
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:
Climate in Santiago de Compostela in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +24°C | +23°C | +19°C | ||||
| Min. temperature | ||||||
| +8°C | +5°C | +3°C | ||||
| Max. temperature | ||||||
| +38°C | +38°C | +31°C | ||||
| Rainfall | ||||||
| 37 mm | 79 mm | 181 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 77% | 79% | 83% | ||||
| Air pressure | ||||||
| 1018 HPa | 1017 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 9 | 7 | ||||
| Cloudy days | ||||||
| 12 | 9 | 7 | ||||
| Rainy days | ||||||
| 9 | 11 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
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 37 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.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Santiago de Compostela is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Santiago de Compostela?
Climate Change over Years
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 2023 with 2201 mm.
FAQ
Is September a good time to visit Santiago de Compostela?
Can you sunbathe in Santiago de Compostela in September?
Is Santiago de Compostela rainy in September?
Is it sunny in Santiago de Compostela in September?
Other cities in Spain
Monthly weather in Santiago de Compostela
Source of the data
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.