Last updated: March 2, 2024
The weather in Charleston, United States, during May is characterized by an average temperature of 21°C (70°F). Highs can soar to 32°C (89°F), while lows may dip to 8°C (46°F). Typically, the humidity level in Charleston throughout May hovers around 82%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Charleston averages 151 mm (6.0 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 14 hours 9 minutes of daylight, with the sun shining for approximately 9 hours 29 minutes each day. Additionally, there is a 32% 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 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 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 | 9 | 10 | 11 | 10 | 8 | 5 | 3 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 30 min | 45 min | |||||