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September Weather in Somonauk, United States

Last updated: June 24, 2025

In September, the average temperature in Somonauk, United States hovers around 20°C (68°F), with a minimum dipping to 2°C (37°F) and a maximum soaring to 34°C (94°F). Expect 107 mm (4.2 in) of precipitation spread over approximately 10 days, contributing to an average humidity of 80%. Embrace the diverse weather as you explore this vibrant location!

September Temperature in Somonauk

In September in Somonauk, the average temperature is 20°C (68°F). Maximum temperatures can reach as high as 34°C (94°F), while minimums can dip down to 2°C (37°F). This varied climate makes Somonauk an ideal destination for travelers seeking both warm days and cool evenings.

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

The chart illustrates September temperature patterns in Somonauk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somonauk, 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 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec242639486172757268543832
Data source: Temperature data for Somonauk 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 Somonauk

In Somonauk in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.

September Precipitation Trends in Somonauk

The chart displays monthly precipitation patterns in Somonauk, 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 Somonauk, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec626086117162137110781071265550
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Somonauk

In Somonauk 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 Somonauk

This chart illustrates the average monthly humidity levels in Somonauk, 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 Somonauk 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 Somonauk

In Somonauk 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 Somonauk.

Maximum UV Index Levels in Somonauk for September

The chart shows the monthly maximum UV Index (UVI) for Somonauk 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 Somonauk typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Somonauk 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 Somonauk Compares to Other Months

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

This table compares monthly weather conditions in Somonauk, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)62 mm (2.4 inches)82%moderate
February Weather-3°C (27°F)60 mm (2.4 inches)83%moderate
March Weather4°C (39°F)86 mm (3.4 inches)84%high
April Weather9°C (49°F)117 mm (4.6 inches)85%very high
May Weather16°C (61°F)162 mm (6.4 inches)79%very high
June Weather22°C (72°F)137 mm (5.4 inches)82%very high
July Weather24°C (75°F)110 mm (4.3 inches)80%very high
August Weather22°C (73°F)78 mm (3.1 inches)81%very high
September Weather20°C (68°F)107 mm (4.2 inches)80%very high
October Weather12°C (54°F)126 mm (5.0 inches)82%high
November Weather4°C (39°F)55 mm (2.2 inches)88%moderate
December Weather0°C (32°F)50 mm (2.0 inches)84%low

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