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September Weather in Warsaw, United States

Last updated: June 24, 2025

The average temperature in Warsaw, United States during September is a pleasant 23°C (74°F). Expect temperatures to vary, with a minimum of 11°C (53°F) and a maximum reaching 35°C (94°F). During this month, the area receives about 108 mm (4.3 in) of precipitation over approximately 11 days, contributing to an average humidity of 78%.

September Temperature in Warsaw

In September in Warsaw, the average temperature is 23°C (74°F). The maximum can reach 35°C (94°F) and the minimum can be as low as 11°C (53°F). This makes it an ideal time to explore Warsaw while enjoying warm days and cooler evenings.

September Weather in Warsaw: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Warsaw, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Warsaw, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (94°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec394349596776817873645044
Data source: Temperature data for Warsaw generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Warsaw

In Warsaw in September, the precipitation amount is 108 mm (4.3 in) over the course of 11 days.

September Precipitation Trends in Warsaw

The chart displays monthly precipitation patterns in Warsaw, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Warsaw, September typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec659683971111161291681081237992
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Warsaw

In Warsaw in September humidity is 78%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace, making travel somewhat stifling and prompting frequent breaks to hydrate and seek shade.

September Average Humidity in Warsaw

This chart illustrates the average monthly humidity levels in Warsaw, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Warsaw is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%82%81%80%82%81%81%78%80%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Warsaw

In Warsaw in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Warsaw.

Maximum UV Index Levels in Warsaw for September

The chart shows the monthly maximum UV Index (UVI) for Warsaw in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Warsaw typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101010108753
Data source: Warsaw September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Warsaw Compares to Other Months

Weather in Warsaw varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Warsaw, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Warsaw, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)65 mm (2.6 inches)84%moderate
February Weather6°C (44°F)95 mm (3.8 inches)83%high
March Weather9°C (49°F)83 mm (3.3 inches)82%high
April Weather15°C (59°F)97 mm (3.8 inches)81%very high
May Weather20°C (68°F)111 mm (4.4 inches)80%very high
June Weather24°C (76°F)116 mm (4.6 inches)82%very high
July Weather27°C (81°F)129 mm (5.1 inches)81%very high
August Weather26°C (79°F)168 mm (6.6 inches)81%very high
September Weather23°C (74°F)108 mm (4.3 inches)78%very high
October Weather18°C (64°F)123 mm (4.8 inches)80%high
November Weather10°C (50°F)79 mm (3.1 inches)84%moderate
December Weather7°C (44°F)92 mm (3.6 inches)84%moderate

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