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September Weather in South Chicago, United States

Last updated: June 24, 2025

In September, the average temperature in South Chicago, United States hovers around 20°C (68°F). Expect a comfortable range with minimums dipping to 11°C (51°F) and maximums soaring up to 29°C (84°F). During this month, anticipate 76 mm (3.0 in) of precipitation spread over approximately 9 days, and enjoy the lush feel with an average humidity of 80%.

September Temperature in South Chicago

In September, in South Chicago, the average temperature is 20°C (68°F), with maximums reaching up to 29°C (84°F) and minimums dropping to as low as 11°C (51°F). This mild climate makes South Chicago an ideal destination for travelers seeking pleasant weather and a comfortable outdoor experience.

September Weather in South Chicago: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Chicago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Chicago, September typically has an average temperature of 20°C (68°F), with highs reaching up to 29°C (84°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec282937435466727368564135
Data source: Temperature data for South Chicago 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 South Chicago

In South Chicago in September, the precipitation amount is 76 mm (3.0 in) spread over a period of 9 days.

September Precipitation Trends in South Chicago

The chart displays monthly precipitation patterns in South Chicago, 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 South Chicago, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec91891111321631337772761709086
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Chicago

In South Chicago 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 South Chicago

This chart illustrates the average monthly humidity levels in South Chicago, 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 South Chicago 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 South Chicago

In South Chicago 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 South Chicago.

Maximum UV Index Levels in South Chicago for September

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

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

This table compares monthly weather conditions in South Chicago, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)91 mm (3.6 inches)82%moderate
February Weather-2°C (30°F)89 mm (3.5 inches)83%moderate
March Weather3°C (37°F)111 mm (4.4 inches)84%high
April Weather6°C (44°F)132 mm (5.2 inches)85%very high
May Weather12°C (54°F)163 mm (6.4 inches)79%very high
June Weather19°C (66°F)133 mm (5.2 inches)82%very high
July Weather22°C (73°F)77 mm (3.0 inches)80%very high
August Weather23°C (73°F)72 mm (2.9 inches)81%very high
September Weather20°C (68°F)76 mm (3.0 inches)80%very high
October Weather13°C (56°F)170 mm (6.7 inches)82%high
November Weather5°C (42°F)90 mm (3.6 inches)88%moderate
December Weather2°C (35°F)86 mm (3.4 inches)84%low

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