Warsaw Weather in September
Poland · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Warsaw sees average temperatures ranging from a low of 11.3°C (52.3°F) to a high of 20.6°C (69.1°F), with a mean of 15.8°C (60.4°F). Compared to the annual average of 10.2°C (50.4°F), this month is 5.6°C warmer than the yearly norm. Precipitation averages 51.2mm, making it approximately 9.0mm drier than the monthly average of 60.0mm. The city receives an average of 9.1 hours of sunshine per day during September, with relative humidity averaging 73.9%. Wind speeds reach an average maximum of 16.7 km/h. For travelers, this month offers a temperature experience in Warsaw, with drier-than-average conditions compared to the rest of the year.
Warsaw's humid continental climate creates four distinct seasons with cold winters and warm summers. I've studied the data and found that the city experiences beautiful autumns and springs. The best time for visiting is May to September, when temperatures are comfortable and the city's historic Old Town can be explored in pleasant weather.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 20.3°C (68.5°F) | 15.8°C (60.4°F) | 10.6°C (51.1°F) |
| Rainfall | 99.6mm | 51.2mm | 55.4mm |
| Sunshine | 10.4 hrs | 9.1 hrs | 6.1 hrs |
| Humidity | 71.1% | 73.9% | 81.7% |
| Wind | 16.1 km/h | 16.7 km/h | 19.1 km/h |
| Rainy Days | 18.4 | 12.2 | 17.2 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Warsaw in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Warsaw in September?
The average temperature in Warsaw during September ranges from 11.3°C (52.3°F) to 20.6°C (69.1°F), with a mean of 15.8°C (60.4°F).
How much does it rain in Warsaw in September?
Warsaw receives an average of 51.2mm of precipitation in September, spread across approximately 12.2 rainy days.
What should I pack for Warsaw in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Warsaw?
September is a good time to visit Warsaw, with comfortable temperatures and manageable rainfall.
Other Months for Warsaw
Cities with Similar September Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 52.23°, 21.01°. Timezone: Europe/Warsaw. Last updated: 2026-07-30.