Santiago de Compostela weather in September
September in Santiago de Compostela: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Santiago de Compostela · #220 of 897 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Santiago de Compostela in September
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Santiago de Compostela climate normals — September
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 56°F | |
| Rainfall | 78 mm / 3.1 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 12.5 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Santiago de Compostela in September — FAQ
- Is September a good time to visit Santiago de Compostela?
- September in Santiago de Compostela: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Santiago de Compostela on SeasonMap's comfort score (89/100).
- What is the weather like in Santiago de Compostela in September?
- In September, Santiago de Compostela averages a daily high of 22.1°C and a low of 13.6°C, with about 77.9 mm of rain over roughly 11.2 rainy days.
- What is the air quality in Santiago de Compostela in September?
- Santiago de Compostela has a mean US Air Quality Index of about 34 in September.