Bologna weather in September
September in Bologna: warm, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Bologna · #85 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Bologna climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 74 mm / 2.9 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.5 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Bologna in September — FAQ
- Is September a good time to visit Bologna?
- September in Bologna: warm, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Bologna on SeasonMap's comfort score (89/100).
- What is the weather like in Bologna in September?
- In September, Bologna averages a daily high of 26.2°C and a low of 16.1°C, with about 74.1 mm of rain over roughly 7.8 rainy days.
- What is the air quality in Bologna in September?
- Bologna has a mean US Air Quality Index of about 45 in September.