Last updated: March 2, 2024
The weather in Charleston, United States, during August is characterized by an average temperature of 23°C (74°F). Highs can soar to 32°C (90°F), while lows may dip to 14°C (58°F). Typically, the humidity level in Charleston throughout August hovers around 73%.
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Average temperature
Maximum temperature
Humidity
In August, Charleston averages 114 mm (4.5 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 13 hours 34 minutes of daylight, with the sun shining for approximately 10 hours 11 minutes each day. Additionally, there is a 41% probability of sunny days during this period.
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Chance of sun
In August, the UV Index in Charleston reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 4 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||