Last updated: March 2, 2024
The weather in Folly Beach, United States, during September is characterized by an average temperature of 26°C (78°F). Highs can soar to 33°C (91°F), while lows may dip to 17°C (63°F). Typically, the humidity level in Folly Beach throughout September hovers around 83%.
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Average temperature
Maximum temperature
Humidity
In September, Folly Beach averages 176 mm (6.9 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 12 hours 19 minutes of daylight, with the sun shining for approximately 9 hours 59 minutes each day. Additionally, there is a 51% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Folly Beach reaches a maximum of 9, 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 | 7 | 5 | 3 | 1 | 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 | ||||||