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September Weather in Wheaton, United States

Last updated: June 24, 2025

In Wheaton, United States during September, the average temperature hovers around 17°C (63°F), with potential extremes ranging from a brisk 1°C (33°F) to a sweltering 33°C (92°F). Rainfall averages 78 mm (3.1 in) over the course of 8 days, contributing to a notably high average humidity of 82%.

September Temperature in Wheaton

In September in Wheaton, the average temperature is 17°C (63°F). Maximum temperatures can reach 33°C (92°F), while the minimum can drop as low as 1°C (33°F). It's advisable to pack layers to accommodate the varying temperatures during your travels.

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 17°C (63°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec141430415871747063463222
Data source: Temperature data for Wheaton 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 Wheaton

In Wheaton in September, the total precipitation amount is 78 mm (3.1 in) over the course of 8 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 78 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1918375880798712178792336
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wheaton

In Wheaton in September, humidity is 82%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%89%81%82%76%81%82%83%82%82%87%84%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3567910997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (14°F)19 mm (0.7 inches)85%moderate
February Weather-10°C (14°F)18 mm (0.7 inches)89%moderate
March Weather-1°C (31°F)37 mm (1.5 inches)81%high
April Weather5°C (41°F)57 mm (2.3 inches)82%high
May Weather14°C (58°F)80 mm (3.2 inches)76%very high
June Weather22°C (71°F)79 mm (3.1 inches)81%very high
July Weather23°C (74°F)87 mm (3.4 inches)82%very high
August Weather21°C (70°F)120 mm (4.7 inches)83%very high
September Weather17°C (63°F)78 mm (3.1 inches)82%high
October Weather8°C (47°F)79 mm (3.1 inches)82%moderate
November Weather0°C (32°F)23 mm (0.9 inches)87%moderate
December Weather-5°C (22°F)36 mm (1.4 inches)84%low

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