May Weather in Charleston

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%.

0°C (33°F)

Minimum temperature

12°C (54°F)

Average temperature

30°C (86°F)

Maximum temperature

76%

Humidity

Precipitation and Sunshine hours

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.

97 mm (3.8 inches)

Precipitation

10 rainy days

Rainy days

9 hours 8 minutes

Sunshine hours

35%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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