Poznań weather in September
September in Poznań: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Poznań · #319 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Poznań in September
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Poznań climate normals — September
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Rainfall | 45 mm / 1.8 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 11°C / 51°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.7 h | |
| Wind | 17 km/h / 10 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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Poznań in September — FAQ
- Is September a good time to visit Poznań?
- September in Poznań: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Poznań on SeasonMap's comfort score (87/100).
- What is the weather like in Poznań in September?
- In September, Poznań averages a daily high of 20.1°C and a low of 11.9°C, with about 44.6 mm of rain over roughly 9.2 rainy days.
- What is the air quality in Poznań in September?
- Poznań has a mean US Air Quality Index of about 45 in September.