Last updated: March 2, 2024
The weather in Charleston, United States, during May is characterized by an average temperature of 12°C (54°F). Highs can soar to 30°C (86°F), while lows may dip to 0°C (33°F). Typically, the humidity level in Charleston throughout May hovers around 76%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Charleston averages 97 mm (3.8 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 14 hours 52 minutes of daylight, with the sun shining for approximately 9 hours 8 minutes each day. Additionally, there is a 35% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In May, the UV Index in Charleston reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 2 | 4 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 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 | ||||||