September Weather in Wheaton, United States

Last updated: June 24, 2025

In Wheaton, United States, the average temperature in September hovers around 23°C (73°F). Expect temperature fluctuations, with a minimum of 7°C (45°F) and a maximum reaching up to 34°C (93°F). This month also brings 56 mm (2.2 in) of precipitation, typically spread over 7 days, alongside an average humidity level of 64%. Enjoy the varied climate!

September Temperature in Wheaton

In September in Wheaton, the average temperature is 23°C (73°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 7°C (45°F). This range makes it an ideal time for travelers to enjoy outdoor activities while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Wheaton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wheaton, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Wheaton

In Wheaton in September, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.

September Precipitation Trends in Wheaton

The chart displays monthly precipitation patterns in Wheaton, 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 Wheaton, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 7 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 Wheaton

In Wheaton in September, humidity is 64%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel quite comfortable yet slightly sticky, urging travelers to enjoy leisurely activities early in the day or seek shade during peak hours.

September Average Humidity in Wheaton

This chart illustrates the average monthly humidity levels in Wheaton, 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 Wheaton is approximately 64%, 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 Wheaton

In Wheaton 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 Wheaton.

Maximum UV Index Levels in Wheaton for September

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

Data source: Wheaton 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 Wheaton Compares to Other Months

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

This table compares monthly weather conditions in Wheaton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	91 mm (3.6 inches)	81%	moderate
February Weather	4°C (39°F)	95 mm (3.7 inches)	78%	high
March Weather	10°C (50°F)	159 mm (6.3 inches)	76%	high
April Weather	13°C (56°F)	174 mm (6.8 inches)	78%	very high
May Weather	19°C (66°F)	172 mm (6.8 inches)	83%	very high
June Weather	24°C (76°F)	104 mm (4.1 inches)	83%	extreme
July Weather	26°C (79°F)	93 mm (3.7 inches)	78%	extreme
August Weather	25°C (77°F)	120 mm (4.7 inches)	68%	very high
September Weather	23°C (73°F)	56 mm (2.2 inches)	64%	very high
October Weather	15°C (59°F)	161 mm (6.3 inches)	70%	high
November Weather	8°C (47°F)	70 mm (2.7 inches)	83%	moderate
December Weather	6°C (42°F)	61 mm (2.4 inches)	87%	moderate