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September Weather in Champaign, United States

Last updated: June 24, 2025

In September, the average temperature in Champaign, United States is a pleasant 21°C (70°F). Expect a range from a cool 6°C (42°F) to a warm 34°C (94°F). With an average precipitation of 83 mm (3.3 in) over 7 days, be prepared for some showers. The humidity is notably high at 79%, adding a touch of tropical ambiance to your experience!

September Temperature in Champaign

In September in Champaign, the average temperature is 21°C (70°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 6°C (42°F). This pleasant temperature range makes Champaign an ideal destination for travelers looking to enjoy a comfortable climate.

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

The chart illustrates September temperature patterns in Champaign, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Champaign, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec293243526574777470574136
Data source: Temperature data for Champaign 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 Champaign

In Champaign in September, the total precipitation amount is 83 mm (3.3 in) over the course of 7 days.

September Precipitation Trends in Champaign

The chart displays monthly precipitation patterns in Champaign, 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 Champaign, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec787711412014210384102831167556
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Champaign

In Champaign in September humidity is 79%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor exploration a bit sticky but still enjoyable for travelers who appreciate the lush, vibrant atmosphere.

September Average Humidity in Champaign

This chart illustrates the average monthly humidity levels in Champaign, 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 Champaign is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Champaign

In Champaign 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 Champaign.

Maximum UV Index Levels in Champaign for September

The chart shows the monthly maximum UV Index (UVI) for Champaign 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 Champaign typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Champaign 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 Champaign Compares to Other Months

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

This table compares monthly weather conditions in Champaign, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)78 mm (3.1 inches)84%moderate
February Weather0°C (32°F)77 mm (3.0 inches)82%moderate
March Weather6°C (43°F)114 mm (4.5 inches)84%high
April Weather11°C (53°F)120 mm (4.7 inches)83%very high
May Weather18°C (65°F)142 mm (5.6 inches)80%very high
June Weather24°C (75°F)103 mm (4.1 inches)83%extreme
July Weather25°C (78°F)84 mm (3.3 inches)82%very high
August Weather23°C (75°F)102 mm (4.0 inches)82%very high
September Weather21°C (70°F)83 mm (3.3 inches)79%very high
October Weather14°C (58°F)116 mm (4.5 inches)79%high
November Weather5°C (42°F)75 mm (2.9 inches)88%moderate
December Weather2°C (36°F)56 mm (2.2 inches)87%moderate

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