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Poznań Weather in September
In Poznań, September brings pleasant daytime temperatures around 20°C (68°F), with nights cooling to 10°C (50°F). Some rainfall is to be expected.
Rainfall in Poznań in September
Typically around 11 days of rainfall are expected, averaging 54 mm (2.1 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Poznań in September
Poznań in September has excellent weather. Days reach 20°C (68°F) and nights cool to 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows of 10°C (50°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Poznań in September
The month experiences a moderate amount of sunlight, with 166 hours of sunshine. This provides a nice balance between sunshine and clouds.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Poznań.
Poznań Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
20°C (68°F)
Chance of Rain
38%
Precipitation
54 mm (2.1 in)
Rainy days
11 days
Humidity
77%
Sunshine
166 hours
Percentage Sunshine
Poznań Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Poznań - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Poznań typically drop from around 21°C (70°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Poznań in September
Browse day-by-day weather records for Poznań spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Poznań historical weather extremes in September
Based on weather observations in Poznań between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 3, 2024, with a maximum of 32°C (90°F).
- The coldest September day was on September 25, 1996, with a maximum of 9°C (48°F).
- The lowest overnight temperature recorded in September was -1°C (30°F) (September 27, 1977).
Best Places in Poland in September
Find out more about the weather in Poland and which places have the best travel conditions in this month. See all of Poland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Poznań in September
For Poznań in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Poznań in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Poznań 3-Day Forecast
More climate data for Poznań
Temperature Rainfall Sunshine Humidity
See the full Poznań climate overview or explore weather in Poland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Poznań
20°C (68°F) Kraków
20°C (68°F) Warsaw20°C (68°F) Gdańsk19°C (66°F) Gdynia
18°C (64°F) Sopot19°C (66°F) Kołobrzeg19°C (66°F) Zakopane17°C (63°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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