Last updated: June 24, 2025
In South Charleston, United States, the average temperature in September hovers around 21°C (69°F), ideal for outdoor activities. However, be prepared for a temperature range between a brisk 5°C (42°F) and a warm 34°C (94°F). During this month, you can expect 91 mm (3.6 in) of precipitation spread over about 8 days, and with an average humidity of 73%, the air may feel comfortably fresh or slightly muggy. Plan accordingly to make the most of your visit!
In September in South Charleston, the average temperature is 21°C (69°F), with maximums reaching 34°C (94°F) and minimums as low as 5°C (42°F). This varied climate makes it an ideal destination for travelers seeking both warm and cool experiences.
In South Charleston in September, the total precipitation amount is 91 mm (3.6 in) over the course of 8 days.
In South Charleston in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.
In South Charleston 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 South Charleston.
UV Risk Categories
Weather in South Charleston varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in South Charleston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 79 mm (3.1 inches) | 88% | moderate |
| February Weather | 1°C (35°F) | 111 mm (4.4 inches) | 88% | moderate |
| March Weather | 6°C (43°F) | 116 mm (4.6 inches) | 87% | high |
| April Weather | 11°C (52°F) | 111 mm (4.4 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 125 mm (4.9 inches) | 81% | very high |
| June Weather | 22°C (72°F) | 135 mm (5.3 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 114 mm (4.5 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 87 mm (3.4 inches) | 73% | very high |
| September Weather | 21°C (69°F) | 91 mm (3.6 inches) | 73% | very high |
| October Weather | 14°C (58°F) | 95 mm (3.8 inches) | 78% | high |
| November Weather | 6°C (42°F) | 98 mm (3.9 inches) | 89% | moderate |
| December Weather | 2°C (37°F) | 102 mm (4.0 inches) | 87% | moderate |