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September Weather in Carterville, United States

Last updated: June 24, 2025

In September, the average temperature in Carterville, United States is a pleasant 23°C (74°F). Expect a range from a cool 6°C (44°F) to a warm 35°C (95°F). During this month, you can anticipate 80 mm (3.2 in) of precipitation spread over 6 days, contributing to an average humidity of 64%. Plan accordingly to make the most of your visit!

September Temperature in Carterville

In September in Carterville, the average temperature is 23°C (74°F), with maximums reaching up to 35°C (95°F) and minimums dipping as low as 6°C (44°F). This makes Carterville a great destination for travelers seeking a variety of experiences in comfortable weather.

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

The chart illustrates September temperature patterns in Carterville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carterville, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec363850576777807874604742
Data source: Temperature data for Carterville 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 Carterville

In Carterville in September, the precipitation amount is 80 mm (3.2 in) over a span of 6 days.

September Precipitation Trends in Carterville

The chart displays monthly precipitation patterns in Carterville, 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 Carterville, September typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec74641361311868794110801295446
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Carterville

In Carterville in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Carterville

This chart illustrates the average monthly humidity levels in Carterville, 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 Carterville is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Carterville

In Carterville 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 Carterville.

Maximum UV Index Levels in Carterville for September

The chart shows the monthly maximum UV Index (UVI) for Carterville 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 Carterville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Carterville 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 Carterville Compares to Other Months

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

This table compares monthly weather conditions in Carterville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)74 mm (2.9 inches)81%moderate
February Weather3°C (38°F)64 mm (2.5 inches)78%high
March Weather10°C (51°F)136 mm (5.4 inches)76%high
April Weather14°C (57°F)131 mm (5.2 inches)78%very high
May Weather20°C (68°F)186 mm (7.3 inches)83%very high
June Weather25°C (78°F)87 mm (3.4 inches)83%extreme
July Weather27°C (81°F)93 mm (3.7 inches)78%extreme
August Weather26°C (78°F)110 mm (4.3 inches)68%very high
September Weather23°C (74°F)80 mm (3.2 inches)64%very high
October Weather15°C (60°F)129 mm (5.1 inches)70%high
November Weather9°C (48°F)54 mm (2.1 inches)83%moderate
December Weather6°C (42°F)46 mm (1.8 inches)87%moderate

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