May Weather in Charleston

Last updated: March 2, 2024

The weather in Charleston, United States, during May is characterized by an average temperature of 19°C (66°F). Highs can soar to 31°C (88°F), while lows may dip to 5°C (40°F). Typically, the humidity level in Charleston throughout May hovers around 82%.

5°C (40°F)

Minimum temperature

19°C (66°F)

Average temperature

31°C (88°F)

Maximum temperature

82%

Humidity

Precipitation and Sunshine hours

In May, Charleston averages 159 mm (6.3 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 14 hours 16 minutes of daylight, with the sun shining for approximately 9 hours 27 minutes each day. Additionally, there is a 33% probability of sunny days during this period.

159 mm (6.3 inches)

Precipitation

17 rainy days

Rainy days

9 hours 27 minutes

Sunshine hours

33%

Chance of sun

UV Index

In May, 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.

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 1 3 5 7 9 10 10 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

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