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September Weather in Olympia Fields, United States

Last updated: June 24, 2025

In September, the average temperature in Olympia Fields, 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 Olympia Fields

In September in Olympia Fields, 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 Olympia Fields: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Olympia Fields, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Olympia Fields, 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 Olympia Fields 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 Olympia Fields

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

September Precipitation Trends in Olympia Fields

The chart displays monthly precipitation patterns in Olympia Fields, 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 Olympia Fields, 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 Olympia Fields

In Olympia Fields 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 Olympia Fields

This chart illustrates the average monthly humidity levels in Olympia Fields, 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 Olympia Fields 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 Olympia Fields

In Olympia Fields 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 Olympia Fields.

Maximum UV Index Levels in Olympia Fields for September

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

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

This table compares monthly weather conditions in Olympia Fields, 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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