nomadseason

September Weather in Rantoul, United States

Last updated: June 24, 2025

In September, the average temperature in Rantoul, United States hovers around 21°C (70°F), offering a pleasant climate for visitors. Expect temperatures to range from a cool 5°C (42°F) to a warm 34°C (94°F). However, be prepared for some rain, as the region experiences approximately 80 mm (3.2 in) of precipitation spread over 8 days. With an average humidity of 80%, staying hydrated and comfortable during your stay is essential.

September Temperature in Rantoul

In September in Rantoul, the average temperature is 21°C (70°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 5°C (42°F). This makes it an ideal time for travelers who enjoy warm weather but should also be prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Rantoul, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rantoul, 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 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec283042526474777470574135
Data source: Temperature data for Rantoul generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Rantoul

In Rantoul in September, the total precipitation amount is 80 mm (3.2 in), occurring over a span of 8 days.

September Precipitation Trends in Rantoul

The chart displays monthly precipitation patterns in Rantoul, 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 Rantoul, September typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec757411612514511080103801207253
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Rantoul

In Rantoul in September humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

September Average Humidity in Rantoul

This chart illustrates the average monthly humidity levels in Rantoul, 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 Rantoul is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rantoul

In Rantoul 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 Rantoul.

Maximum UV Index Levels in Rantoul for September

The chart shows the monthly maximum UV Index (UVI) for Rantoul 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 Rantoul typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Rantoul 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 Rantoul Compares to Other Months

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

This table compares monthly weather conditions in Rantoul, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)75 mm (2.9 inches)82%moderate
February Weather-1°C (31°F)74 mm (2.9 inches)83%moderate
March Weather6°C (42°F)116 mm (4.6 inches)84%high
April Weather11°C (52°F)124 mm (4.9 inches)85%very high
May Weather18°C (65°F)145 mm (5.7 inches)79%very high
June Weather23°C (74°F)110 mm (4.3 inches)82%extreme
July Weather25°C (77°F)80 mm (3.1 inches)80%very high
August Weather23°C (74°F)103 mm (4.0 inches)81%very high
September Weather21°C (70°F)80 mm (3.2 inches)80%very high
October Weather14°C (57°F)120 mm (4.7 inches)82%high
November Weather5°C (41°F)72 mm (2.8 inches)88%moderate
December Weather2°C (35°F)53 mm (2.1 inches)84%low

Compare Rantoul's Climate with Cities Worldwide