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September Weather in Elgin, United States

Last updated: June 24, 2025

In Elgin, United States, the average temperature in September hovers around 18°C (64°F), with a minimum of 2°C (35°F) and a comfortable high of 33°C (91°F). This month also sees 116 mm (4.6 in) of precipitation spread over about 10 days, contributing to an average humidity level of 80%.

September Temperature in Elgin

In September in Elgin, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (35°F). It's advisable to pack layers to accommodate the warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Elgin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Elgin, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec181834445970737064483425
Data source: Temperature data for Elgin 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 Elgin

In Elgin in September, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in Elgin

The chart displays monthly precipitation patterns in Elgin, 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 Elgin, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec35455793146135951271161094745
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Elgin

In Elgin in September humidity is 80%. With an average temperature of 18°C (64°F), this humidity feels like a warm, damp blanket wrapping around you, making travel a bit more exhausting as the air thickens and the heat clings to your skin.

September Average Humidity in Elgin

This chart illustrates the average monthly humidity levels in Elgin, 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 Elgin is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Elgin

In Elgin in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Elgin.

Maximum UV Index Levels in Elgin for September

The chart shows the monthly maximum UV Index (UVI) for Elgin 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 Elgin typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3458910997532
Data source: Elgin 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 Elgin Compares to Other Months

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

This table compares monthly weather conditions in Elgin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)35 mm (1.4 inches)88%moderate
February Weather-8°C (19°F)45 mm (1.8 inches)89%moderate
March Weather1°C (34°F)57 mm (2.2 inches)86%moderate
April Weather7°C (44°F)93 mm (3.7 inches)85%very high
May Weather15°C (59°F)146 mm (5.7 inches)79%very high
June Weather21°C (71°F)135 mm (5.3 inches)80%very high
July Weather23°C (74°F)95 mm (3.7 inches)80%very high
August Weather21°C (70°F)127 mm (5.0 inches)78%very high
September Weather18°C (64°F)116 mm (4.6 inches)80%high
October Weather9°C (49°F)109 mm (4.3 inches)84%moderate
November Weather1°C (34°F)47 mm (1.9 inches)89%moderate
December Weather-4°C (25°F)45 mm (1.8 inches)85%low

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