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September Weather in Warsaw, United States

Last updated: June 24, 2025

In September, the average temperature in Warsaw, United States is a comfortable 17°C (63°F). Temperatures can range from a chilly 2°C (35°F) at their lowest to a warm 31°C (88°F) at their peak. Visitors can anticipate 75 mm (3.0 in) of precipitation over approximately 10 days, accompanied by an average humidity of 76%. Embrace the variety of weather while exploring this vibrant locale!

September Temperature in Warsaw

In September in Warsaw, the average temperature is 17°C (63°F). Maximum temperatures can reach 31°C (88°F), while minimums can drop as low as 2°C (35°F). Travelers should be prepared for a wide range of weather conditions.

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 17°C (63°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec252734445766706963523830
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 75 mm (3.0 in) spread over a duration of 10 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 75 mm (3.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec838981120118101144104751409497
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 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
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 Weather-4°C (25°F)83 mm (3.3 inches)91%moderate
February Weather-3°C (28°F)89 mm (3.5 inches)91%moderate
March Weather1°C (34°F)81 mm (3.2 inches)88%high
April Weather7°C (45°F)120 mm (4.7 inches)88%very high
May Weather14°C (57°F)118 mm (4.6 inches)82%very high
June Weather19°C (66°F)101 mm (4.0 inches)79%very high
July Weather21°C (71°F)144 mm (5.7 inches)77%very high
August Weather20°C (69°F)104 mm (4.1 inches)72%very high
September Weather17°C (63°F)75 mm (3.0 inches)76%very high
October Weather11°C (52°F)140 mm (5.5 inches)83%high
November Weather3°C (38°F)94 mm (3.7 inches)88%moderate
December Weather-1°C (31°F)97 mm (3.8 inches)87%low

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