Weather in Poznan in September 2025
Average weather
Average temperature in Poznan in September
Going from a maximum of +84°F during the day to a minimum of +48°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +68°F to +68°F.
Is Poznan warm or cold in September?
Poznan is typically mild in September.
Maximum temperatures go down compared to the previous month from +75°F to +66°F. The minimum temperature also goes down from +57°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Poznan:
Climate in Poznan in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +75°F | +66°F | +55°F | ||||
| Min. temperature | ||||||
| +41°F | +34°F | +23°F | ||||
| Max. temperature | ||||||
| +99°F | +93°F | +79°F | ||||
| Rainfall | ||||||
| 67 mm | 47 mm | 39 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 70% | 76% | 81% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 9 | 6 | ||||
| Cloudy days | ||||||
| 4 | 6 | 10 | ||||
| Rainy days | ||||||
| 15 | 15 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +75°F in the day, the average maximum temperature lowers to +66°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 67 mm to 47 mm. Humidity rises from 70% to 76%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 9 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Poznan is gradually increasing during September, going from 3 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Poznan?
Climate Change Over the Years
The climate in Poznan in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1980 (+50°F) and the highest in 2019 (+60°F). The driest year was 2003 with only 280 mm of rainfall, and the wettest year was 2023 with 907 mm.
FAQ
Is September a good time to visit Poznan?
Can you sunbathe in Poznan in September?
Is Poznan rainy in September?
Is it sunny in Poznan in September?
Other cities in Poland
Monthly weather in Poznan
Source of the data
For this page, we’ve looked at the typical weather in Poznan, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.