Last updated: June 24, 2025
In September, the average temperature in Mount Pleasant, United States hovers around 21°C (70°F), offering a pleasant climate. Expect a minimum of 6°C (44°F) and peaks reaching up to 35°C (95°F). During this month, you can anticipate approximately 110 mm (4.3 in) of precipitation spread over 8 days, with an average humidity level of 78%, creating a tropical ambiance.
In September in Mount Pleasant, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop as low as 6°C (44°F). This varied climate makes Mount Pleasant an ideal destination for travelers looking to experience both warm and cool weather during their visit.
In Mount Pleasant in September, the precipitation amount is 110 mm (4.3 in) over a period of 8 days.
In Mount Pleasant in September, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.
In Mount Pleasant 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 Mount Pleasant.
UV Risk Categories
Weather in Mount Pleasant varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mount Pleasant, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 54 mm (2.1 inches) | 81% | moderate |
| February Weather | -3°C (27°F) | 59 mm (2.3 inches) | 81% | moderate |
| March Weather | 5°C (42°F) | 92 mm (3.6 inches) | 81% | high |
| April Weather | 10°C (51°F) | 87 mm (3.4 inches) | 82% | very high |
| May Weather | 18°C (64°F) | 164 mm (6.5 inches) | 78% | very high |
| June Weather | 24°C (75°F) | 145 mm (5.7 inches) | 81% | extreme |
| July Weather | 25°C (78°F) | 72 mm (2.8 inches) | 79% | very high |
| August Weather | 24°C (75°F) | 72 mm (2.8 inches) | 77% | very high |
| September Weather | 21°C (70°F) | 110 mm (4.3 inches) | 78% | very high |
| October Weather | 13°C (55°F) | 132 mm (5.2 inches) | 78% | high |
| November Weather | 4°C (40°F) | 51 mm (2.0 inches) | 87% | moderate |
| December Weather | 1°C (33°F) | 46 mm (1.8 inches) | 84% | moderate |