Last updated: June 24, 2025
In September, the average temperature in Carbondale, United States is a comfortable 18°C (64°F). Expect a minimum of 2°C (35°F) and a maximum of 32°C (89°F), making for a diverse range of weather. However, be prepared for precipitation, with around 97 mm (3.8 in) expected over 9 days, and enjoy the refreshing average humidity of 66%.
In September in Carbondale, the average temperature is 18°C (64°F). Maximums can reach 32°C (89°F) and minimums can be as low as 2°C (35°F). This diverse range of temperatures makes Carbondale a great destination for travelers who appreciate both warm days and cool evenings.
In Carbondale in September, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.
In Carbondale in September humidity is 66%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace that can make outdoor activities slightly uncomfortable if you aren't properly hydrated. Travelers might find themselves longing for shade and refreshing drinks as they explore, but the pleasant temperatures still allow for enjoyable adventures with the right precautions.
In Carbondale 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 Carbondale.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 70 mm (2.8 inches) | 87% | moderate |
| February Weather | -1°C (31°F) | 95 mm (3.7 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 88 mm (3.5 inches) | 85% | high |
| April Weather | 8°C (47°F) | 104 mm (4.1 inches) | 83% | very high |
| May Weather | 15°C (58°F) | 125 mm (4.9 inches) | 75% | very high |
| June Weather | 19°C (67°F) | 92 mm (3.6 inches) | 73% | very high |
| July Weather | 23°C (73°F) | 114 mm (4.5 inches) | 65% | very high |
| August Weather | 21°C (71°F) | 113 mm (4.5 inches) | 62% | very high |
| September Weather | 18°C (64°F) | 97 mm (3.8 inches) | 66% | very high |
| October Weather | 12°C (54°F) | 131 mm (5.1 inches) | 79% | high |
| November Weather | 4°C (40°F) | 86 mm (3.4 inches) | 87% | moderate |
| December Weather | 0°C (33°F) | 89 mm (3.5 inches) | 85% | low |