Warsaw Weather in September
Warsaw in September sees pleasant daytime temperatures of 20°C (68°F) and nighttime lows of 9°C (48°F). Rainfall is fairly high this month at around 64 mm (2.5 in), so pack a rain jacket to stay dry.
Rainfall in Warsaw in September
Historically, approximately 12 days this month are expected to have rain, averaging 64 mm (2.5 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Warsaw in September
September is one of the better months to visit Warsaw. Expect 20°C (68°F) during the day and 9°C (48°F) at night. Conditions are often most pleasant around the middle of the day. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Warsaw in September
The month experiences a moderate amount of sunlight, with 145 hours of sunshine. This provides a nice balance between sunshine and clouds.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Poland, check out our Warsaw's climate page.
Warsaw Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
20°C (68°F)
Chance of Rain
41%
Precipitation
64 mm (2.5 in)
Rainy days
12 days
Humidity
81%
Sunshine
145 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Warsaw typically drop from around 21°C (70°F) at the start of September to approximately 16°C (61°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
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Warsaw in September
Browse day-by-day weather records for Warsaw spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Warsaw historical weather extremes in September
Our historical data for Warsaw spans 1998 to 2025, revealing these weather extremes.
- The warmest day in September was on September 3, 2024, with a maximum of 31°C (88°F).
- The coldest September day was on September 30, 2010, with a maximum of 6°C (43°F).
- The coldest night in September in Warsaw was on September 29, 2001, with a minimum of 0°C (32°F).
- The heaviest September precipitation occurred on September 1, 2010, when 45 mm (1.8 in) of precipitation fell.
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
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unpleasant
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What to Wear in Warsaw in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Warsaw in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Poland, check out our Warsaw's climate page.
Temperature Rainfall Sunshine Humidity
See the full Warsaw climate overview or explore weather in Poland.
