Last updated: June 24, 2025
In September, the average temperature in Charles City, United States hovers around 19°C (66°F). You can expect chilly nights with temperatures dipping as low as 2°C (36°F), while daytime highs can reach a sizzling 33°C (92°F). Be prepared for some rainfall, with an average precipitation of 105 mm (4.1 in) over about 10 days. The air tends to be quite humid, with an average humidity level of 75%.
In September in Charles City, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 2°C (36°F). This diverse climate makes Charles City an ideal destination for travelers looking to experience a range of temperatures and activities.
In Charles City in September, the precipitation amount is 105 mm (4.1 in) over the course of 10 days.
In Charles City in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.
In Charles City 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 Charles City.
UV Risk Categories
Weather in Charles City varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Charles City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 38 mm (1.5 inches) | 82% | moderate |
| February Weather | -7°C (19°F) | 48 mm (1.9 inches) | 84% | moderate |
| March Weather | 2°C (36°F) | 72 mm (2.8 inches) | 80% | moderate |
| April Weather | 8°C (46°F) | 74 mm (2.9 inches) | 81% | very high |
| May Weather | 16°C (60°F) | 159 mm (6.3 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 123 mm (4.8 inches) | 80% | extreme |
| July Weather | 23°C (74°F) | 91 mm (3.6 inches) | 80% | very high |
| August Weather | 21°C (71°F) | 116 mm (4.6 inches) | 77% | very high |
| September Weather | 19°C (66°F) | 105 mm (4.1 inches) | 75% | very high |
| October Weather | 10°C (50°F) | 128 mm (5.0 inches) | 80% | moderate |
| November Weather | 2°C (35°F) | 49 mm (1.9 inches) | 87% | moderate |
| December Weather | -2°C (28°F) | 37 mm (1.4 inches) | 83% | moderate |