Climate averages 1991–2020
Poznań weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Poznań: daytime highs average 18.8°C and nights cool to about 11.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 48 mm of rain on roughly 10 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 44 min on an average September day.
The nearest other city in this atlas is Gniezno (46 km away). In September its highs average 18.4°C, about as warm as Poznań, with 49 mm of rain.
Among the 60 cities listed in Poland, Poznań ranks joint 9th of 60 for the warmest September highs and 1st of 60 for the driest September (rainfall, lowest first). The mean September high of those 60 cities is 18.3°C; Poznań is 0.5°C warmer than that mean.
From September to October, average highs fall by 5.8°C to 12.9°C, and monthly rainfall falls from 48 mm to 41 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Poznań climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.9°C-2.6°C | -2.6°C | 42 | 10.2 | 8.38 h |
| February | 3.6°C-2.1°C | -2.1°C | 34 | 8.9 | 9.910 h |
| March | 7.7°C0.1°C | 0.1°C | 46 | 10.4 | 11.812 h |
| April | 13.8°C4.3°C | 4.3°C | 33 | 8.5 | 13.914 h |
| May | 18.5°C9.3°C | 9.3°C | 54 | 10.8 | 15.716 h |
| June | 21.9°C12.9°C | 12.9°C | 58 | 11.3 | 16.717 h |
| July | 23.8°C15.2°C | 15.2°C | 87 | 12.1 | 16.316 h |
| August | 23.7°C15.0°C | 15.0°C | 64 | 10.4 | 14.715 h |
| September, selected | 18.8°C11.1°C | 11.1°C | 48 | 9.6 | 12.713 h |
| October | 12.9°C6.7°C | 6.7°C | 41 | 9.0 | 10.711 h |
| November | 7.0°C2.4°C | 2.4°C | 38 | 8.7 | 8.89 h |
| December | 3.1°C-1.0°C | -1.0°C | 42 | 10.1 | 7.88 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Gniezno in SeptemberPoland · 46 kmHigh 18.4°C · Low 10.8°C · 49 mm rain
- Piła in SeptemberPoland · 84 kmHigh 18.2°C · Low 10.8°C · 51 mm rain
- Konin in SeptemberPoland · 92 kmHigh 18.9°C · Low 10.8°C · 50 mm rain
- Inowrocław in SeptemberPoland · 100 kmHigh 18.1°C · Low 10.7°C · 50 mm rain
- Ostrów Wielkopolski in SeptemberPoland · 103 kmHigh 18.9°C · Low 10.9°C · 51 mm rain
- Kalisz in SeptemberPoland · 107 kmHigh 19.0°C · Low 10.9°C · 51 mm rain
- Bydgoszcz in SeptemberPoland · 108 kmHigh 18.4°C · Low 10.9°C · 50 mm rain
- Zielona Góra in SeptemberPoland · 110 kmHigh 18.7°C · Low 10.7°C · 50 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Poznań) is explained once on the Poznań year overview and on the Sources, method and limits page.