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September Weather in Carol Stream, United States

Last updated: June 24, 2025

In September, the average temperature in Carol Stream, United States hovers around 19°C (67°F). Daily temperatures can swing from a cool 2°C (36°F) at night to a warm 34°C (93°F) during the day. Expect a total precipitation of 91 mm (3.6 in) spread over about 10 days, contributing to an average humidity level of 80%. Prepare for a mix of mild weather and refreshing moisture!

September Temperature in Carol Stream

In September in Carol Stream, the average temperature is 19°C (67°F). Maximums can reach 34°C (93°F), while minimums can be as low as 2°C (36°F). Pack accordingly to enjoy a range of outdoor activities in this diverse climate!

September Weather in Carol Stream: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Carol Stream, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carol Stream, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec242739486071757267543832
Data source: Temperature data for Carol Stream 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 Carol Stream

In Carol Stream in September, the precipitation amount totals 91 mm (3.6 in) over a span of 10 days.

September Precipitation Trends in Carol Stream

The chart displays monthly precipitation patterns in Carol Stream, 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 Carol Stream, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec61598111716914010699911275453
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Carol Stream

In Carol Stream in September humidity is 80%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor exploration a bit uncomfortable and sticky, yet it encourages you to seek out refreshing indoor activities or shaded spots to escape the heat.

September Average Humidity in Carol Stream

This chart illustrates the average monthly humidity levels in Carol Stream, 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 Carol Stream 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 Carol Stream

In Carol Stream 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 Carol Stream.

Maximum UV Index Levels in Carol Stream for September

The chart shows the monthly maximum UV Index (UVI) for Carol Stream 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 Carol Stream typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
Data source: Carol Stream 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 Carol Stream Compares to Other Months

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

This table compares monthly weather conditions in Carol Stream, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)61 mm (2.4 inches)82%moderate
February Weather-3°C (27°F)59 mm (2.3 inches)83%moderate
March Weather4°C (39°F)81 mm (3.2 inches)84%high
April Weather9°C (48°F)117 mm (4.6 inches)85%very high
May Weather16°C (61°F)168 mm (6.6 inches)79%very high
June Weather22°C (72°F)140 mm (5.5 inches)82%very high
July Weather24°C (75°F)106 mm (4.2 inches)80%very high
August Weather22°C (73°F)99 mm (3.9 inches)81%very high
September Weather19°C (67°F)91 mm (3.6 inches)80%very high
October Weather12°C (54°F)127 mm (5.0 inches)82%high
November Weather3°C (38°F)54 mm (2.1 inches)88%moderate
December Weather0°C (32°F)53 mm (2.1 inches)84%low

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