Climate averages 1991–2020
Ostrów Wielkopolski 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 Ostrów Wielkopolski: daytime highs average 18.9°C and nights cool to about 10.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 51 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 43 min on an average September day.
The nearest other city in this atlas is Kalisz (23 km away). In September its highs average 19.0°C, about as warm as Ostrów Wielkopolski, with 51 mm of rain.
Among the 60 cities listed in Poland, Ostrów Wielkopolski ranks joint 5th of 60 for the warmest September highs and joint 10th of 60 for the driest September (rainfall, lowest first). The mean September high of those 60 cities is 18.3°C; Ostrów Wielkopolski is 0.6°C warmer than that mean.
From September to October, average highs fall by 5.8°C to 13.1°C, and monthly rainfall falls from 51 mm to 43 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
Ostrów Wielkopolski climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.6°C-3.2°C | -3.2°C | 40 | 10.5 | 8.48 h |
| February | 3.4°C-2.6°C | -2.6°C | 36 | 9.4 | 9.910 h |
| March | 7.7°C-0.2°C | -0.2°C | 46 | 10.8 | 11.812 h |
| April | 13.8°C4.1°C | 4.1°C | 34 | 8.5 | 13.814 h |
| May | 18.6°C9.1°C | 9.1°C | 56 | 11.1 | 15.616 h |
| June | 22.0°C12.8°C | 12.8°C | 68 | 11.6 | 16.617 h |
| July | 24.0°C15.0°C | 15.0°C | 93 | 12.3 | 16.216 h |
| August | 24.0°C14.9°C | 14.9°C | 60 | 10.2 | 14.615 h |
| September, selected | 18.9°C10.9°C | 10.9°C | 51 | 9.5 | 12.713 h |
| October | 13.1°C6.5°C | 6.5°C | 43 | 8.7 | 10.711 h |
| November | 7.2°C2.2°C | 2.2°C | 39 | 8.9 | 8.99 h |
| December | 2.9°C-1.5°C | -1.5°C | 42 | 9.9 | 7.98 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
- Kalisz in SeptemberPoland · 23 kmHigh 19.0°C · Low 10.9°C · 51 mm rain
- Konin in SeptemberPoland · 70 kmHigh 18.9°C · Low 10.8°C · 50 mm rain
- Wrocław in SeptemberPoland · 82 kmHigh 19.2°C · Low 11.1°C · 61 mm rain
- Gniezno in SeptemberPoland · 99 kmHigh 18.4°C · Low 10.8°C · 49 mm rain
- Poznań in SeptemberPoland · 103 kmHigh 18.8°C · Low 11.1°C · 48 mm rain
- Pabianice in SeptemberPoland · 107 kmHigh 18.4°C · Low 10.6°C · 56 mm rain
- Opole in SeptemberPoland · 110 kmHigh 19.1°C · Low 10.8°C · 64 mm rain
- Lubin in SeptemberPoland · 115 kmHigh 19.1°C · Low 11.0°C · 54 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 Ostrów Wielkopolski) is explained once on the Ostrów Wielkopolski year overview and on the Sources, method and limits page.