September Weather in Elgin, United States

Last updated: June 24, 2025

In Elgin, United States, the average temperature in September is a pleasant 18°C (65°F). However, you can expect a range with minimums dipping to 1°C (35°F) and maximums climbing to 32°C (90°F). Rainfall is quite notable, with an average precipitation of 122 mm (4.8 in) spread over 11 days. Humidity tends to be on the higher side, averaging around 74%, making for a uniquely refreshing atmosphere.

September Temperature in Elgin

In September in Elgin, the average temperature is 18°C (65°F). Maximums can reach 32°C (90°F), while minimums can be as low as 1°C (35°F). This variety in temperature makes it essential to pack layers for your travels.

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 (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (35°F).

Data source: Temperature data for Elgin generated using information from the Copernicus Climate Change Service.

September Precipitation in Elgin

In Elgin in September, the total precipitation amount is 122 mm (4.8 in) over a span of 11 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 122 mm (4.8 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Elgin

In Elgin in September humidity is 74%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can make even short walks feel laborious, leading travelers to seek shade and refreshment more often.

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 74%, offering insight into how humid the weather typically is during this month.

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 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 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	40 mm (1.6 inches)	84%	moderate
February Weather	-6°C (21°F)	52 mm (2.1 inches)	85%	moderate
March Weather	2°C (36°F)	64 mm (2.5 inches)	84%	moderate
April Weather	7°C (46°F)	76 mm (3.0 inches)	83%	very high
May Weather	15°C (60°F)	162 mm (6.4 inches)	75%	very high
June Weather	22°C (71°F)	132 mm (5.2 inches)	79%	very high
July Weather	23°C (74°F)	103 mm (4.1 inches)	75%	very high
August Weather	21°C (71°F)	104 mm (4.1 inches)	69%	very high
September Weather	18°C (65°F)	122 mm (4.8 inches)	74%	very high
October Weather	10°C (50°F)	136 mm (5.3 inches)	79%	moderate
November Weather	2°C (35°F)	50 mm (2.0 inches)	88%	moderate
December Weather	-2°C (28°F)	38 mm (1.5 inches)	82%	low