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September Weather in Carbondale, United States

Last updated: June 24, 2025

In September, the average temperature in Carbondale, United States hovers around 15°C (58°F). You can expect minimums dipping as low as -4°C (25°F) and maximums peaking at 31°C (88°F). With an average humidity of 65%, the weather can feel quite varied. Be prepared for some light rain, as precipitation totals about 19 mm (0.7 in) over the course of 4 days.

September Temperature in Carbondale

In September in Carbondale, the average temperature is 15°C (58°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as -4°C (25°F). This diverse temperature range makes it essential for travelers to pack accordingly for both warm days and chilly nights.

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

The chart illustrates September temperature patterns in Carbondale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carbondale, September typically has an average temperature of 15°C (58°F), with highs reaching up to 31°C (88°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec212432374761676558413021
Data source: Temperature data for Carbondale 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 Carbondale

In Carbondale in September, the precipitation amount is 19 mm (0.7 in) over the course of 4 days.

September Precipitation Trends in Carbondale

The chart displays monthly precipitation patterns in Carbondale, 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 Carbondale, September typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec628569535223161619675266
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Carbondale

In Carbondale in September, humidity is 65%. With an average temperature of 15°C (58°F), this humidity feels like a mild but slightly muggy experience for traveling, making it essential to stay hydrated and wear breathable clothing to fully enjoy the day.

September Average Humidity in Carbondale

This chart illustrates the average monthly humidity levels in Carbondale, 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 Carbondale is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Carbondale

In Carbondale in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Carbondale.

Maximum UV Index Levels in Carbondale for September

The chart shows the monthly maximum UV Index (UVI) for Carbondale 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 Carbondale typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469121213121210754
Data source: Carbondale 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 Carbondale Compares to Other Months

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

This table compares monthly weather conditions in Carbondale, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)62 mm (2.5 inches)88%moderate
February Weather-4°C (24°F)85 mm (3.3 inches)87%high
March Weather0°C (33°F)69 mm (2.7 inches)81%very high
April Weather3°C (37°F)53 mm (2.1 inches)76%extreme
May Weather8°C (47°F)52 mm (2.1 inches)66%extreme
June Weather16°C (61°F)23 mm (0.9 inches)58%extreme
July Weather20°C (68°F)16 mm (0.6 inches)52%extreme
August Weather19°C (66°F)16 mm (0.6 inches)56%extreme
September Weather15°C (58°F)19 mm (0.7 inches)65%very high
October Weather5°C (41°F)67 mm (2.6 inches)76%high
November Weather-1°C (30°F)52 mm (2.0 inches)82%moderate
December Weather-6°C (21°F)66 mm (2.6 inches)89%moderate

Compare Carbondale's Climate with Cities Worldwide