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September Weather in Park Forest, United States

Last updated: June 24, 2025

In September, the average temperature in Park Forest, United States is a pleasant 20°C (68°F). However, be prepared for temperature variations, as it can dip to a cool 4°C (39°F) or soar to a warm 34°C (94°F). Expect around 80 mm (3.1 in) of precipitation spread over 9 days, and a relatively high average humidity of 80%.

September Temperature in Park Forest

In September in Park Forest, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (94°F), while minimums can dip as low as 4°C (39°F). It's a great time to visit for a mix of warm days and cooler evenings, perfect for outdoor adventures and exploration.

September Weather in Park Forest: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Park Forest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Park Forest, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec272840496172757368554034
Data source: Temperature data for Park Forest 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 Park Forest

In Park Forest in September, the precipitation amount is 80 mm (3.1 in) spread over 9 days.

September Precipitation Trends in Park Forest

The chart displays monthly precipitation patterns in Park Forest, 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 Park Forest, September typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec66699612216314311492801396357
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Park Forest

In Park Forest in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

September Average Humidity in Park Forest

This chart illustrates the average monthly humidity levels in Park Forest, 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 Park Forest 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 Park Forest

In Park Forest 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 Park Forest.

Maximum UV Index Levels in Park Forest for September

The chart shows the monthly maximum UV Index (UVI) for Park Forest 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 Park Forest typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Park Forest 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 Park Forest Compares to Other Months

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

This table compares monthly weather conditions in Park Forest, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)66 mm (2.6 inches)82%moderate
February Weather-2°C (29°F)69 mm (2.7 inches)83%moderate
March Weather4°C (40°F)96 mm (3.8 inches)84%high
April Weather9°C (49°F)122 mm (4.8 inches)85%very high
May Weather16°C (61°F)163 mm (6.4 inches)79%very high
June Weather22°C (72°F)143 mm (5.6 inches)82%very high
July Weather24°C (76°F)114 mm (4.5 inches)80%very high
August Weather23°C (73°F)92 mm (3.6 inches)81%very high
September Weather20°C (68°F)80 mm (3.1 inches)80%very high
October Weather13°C (55°F)139 mm (5.5 inches)82%high
November Weather4°C (40°F)63 mm (2.5 inches)88%moderate
December Weather1°C (34°F)57 mm (2.2 inches)84%low

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