Bilbao weather in September
September in Bilbao: nice, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Bilbao · #280 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Bilbao in September
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Bilbao climate normals — September
| Daytime high | 23°C / 73°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Rainfall | 93 mm / 3.7 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.5 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Bilbao in September — FAQ
- Is September a good time to visit Bilbao?
- September in Bilbao: nice, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Bilbao on SeasonMap's comfort score (87/100).
- What is the weather like in Bilbao in September?
- In September, Bilbao averages a daily high of 22.9°C and a low of 16.9°C, with about 93.2 mm of rain over roughly 13.4 rainy days.
- What is the air quality in Bilbao in September?
- Bilbao has a mean US Air Quality Index of about 39 in September.