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September Weather in Kankakee, United States

Last updated: June 24, 2025

In September, the average temperature in Kankakee, United States is a pleasant 21°C (69°F). However, temperatures can vary significantly, with a minimum of 5°C (41°F) and a maximum reaching up to 34°C (94°F). Expect 73 mm (2.9 in) of precipitation spread over 9 days, contributing to an average humidity of 80%. Be prepared for a mix of mild days and occasionally damp weather!

September Temperature in Kankakee

In September in Kankakee, the average temperature is 21°C (69°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 5°C (41°F). This makes it a great time for travelers to enjoy a variety of outdoor activities while being prepared for some temperature fluctuations.

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

The chart illustrates September temperature patterns in Kankakee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kankakee, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272941506373767469564134
Data source: Temperature data for Kankakee 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 Kankakee

In Kankakee in September, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.

September Precipitation Trends in Kankakee

The chart displays monthly precipitation patterns in Kankakee, 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 Kankakee, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7073981191561179695731306558
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kankakee

In Kankakee in September, humidity is 80%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities a bit challenging for travelers as the air becomes heavy and can lead to fatigue while sightseeing.

September Average Humidity in Kankakee

This chart illustrates the average monthly humidity levels in Kankakee, 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 Kankakee is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kankakee

In Kankakee 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 Kankakee.

Maximum UV Index Levels in Kankakee for September

The chart shows the monthly maximum UV Index (UVI) for Kankakee 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 Kankakee typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Kankakee 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 Kankakee Compares to Other Months

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

This table compares monthly weather conditions in Kankakee, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)70 mm (2.7 inches)82%moderate
February Weather-2°C (30°F)73 mm (2.9 inches)83%moderate
March Weather5°C (41°F)98 mm (3.9 inches)84%high
April Weather10°C (51°F)119 mm (4.7 inches)85%very high
May Weather17°C (63°F)156 mm (6.1 inches)79%very high
June Weather23°C (74°F)117 mm (4.6 inches)82%very high
July Weather25°C (76°F)96 mm (3.8 inches)80%very high
August Weather23°C (74°F)95 mm (3.7 inches)81%very high
September Weather21°C (69°F)73 mm (2.9 inches)80%very high
October Weather13°C (56°F)130 mm (5.1 inches)82%high
November Weather5°C (41°F)65 mm (2.5 inches)88%moderate
December Weather1°C (35°F)58 mm (2.3 inches)84%low

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