September Weather in Warrenville, United States

Last updated: June 24, 2025

In September, the average temperature in Warrenville, United States is a pleasant 25°C (78°F). During this time, temperatures can fluctuate, with a minimum of 11°C (52°F) and a scorching maximum of 38°C (100°F). Expect a moderate precipitation amount of 76 mm (3.0 in) spread over 8 days, and don't forget that the average humidity remains quite high at 83%, creating a warm and humid atmosphere.

September Temperature in Warrenville

In September in Warrenville, the average temperature is 25°C (78°F). Maximums can reach 38°C (100°F) and minimums can be as low as 11°C (52°F). This makes it an ideal time for travelers to enjoy a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Warrenville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Warrenville, September typically has an average temperature of 25°C (78°F), with highs reaching up to 38°C (100°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Warrenville

In Warrenville in September, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.

September Precipitation Trends in Warrenville

The chart displays monthly precipitation patterns in Warrenville, 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 Warrenville, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Warrenville

In Warrenville in September, humidity is 83%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, damp embrace, making travel sticky and exhausting, as each movement can leave you drenched in sweat.

September Average Humidity in Warrenville

This chart illustrates the average monthly humidity levels in Warrenville, 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 Warrenville is approximately 83%, 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 Warrenville

In Warrenville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Warrenville.

Maximum UV Index Levels in Warrenville for September

The chart shows the monthly maximum UV Index (UVI) for Warrenville 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 Warrenville typically reaches 9, which falls under the very high exposure category.

Data source: Warrenville 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 Warrenville Compares to Other Months

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

This table compares monthly weather conditions in Warrenville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	86 mm (3.4 inches)	86%	moderate
February Weather	12°C (54°F)	114 mm (4.5 inches)	81%	high
March Weather	15°C (59°F)	83 mm (3.3 inches)	81%	very high
April Weather	19°C (66°F)	113 mm (4.4 inches)	79%	very high
May Weather	23°C (74°F)	102 mm (4.0 inches)	75%	extreme
June Weather	26°C (79°F)	106 mm (4.2 inches)	75%	extreme
July Weather	28°C (82°F)	132 mm (5.2 inches)	80%	extreme
August Weather	27°C (81°F)	137 mm (5.4 inches)	81%	extreme
September Weather	25°C (78°F)	76 mm (3.0 inches)	83%	very high
October Weather	21°C (69°F)	81 mm (3.2 inches)	78%	very high
November Weather	13°C (55°F)	62 mm (2.4 inches)	85%	high
December Weather	11°C (51°F)	119 mm (4.7 inches)	87%	moderate