May weather forecast and climate
Charleston, SC

Trees along both sides of a street in Charleston, South Carolina, seen in the twilight light
Trees along both sides of a street in Charleston, South Carolina, seen in the twilight light

What is the temperature in May in Charleston?

The average high-temperature, in May, in Charleston, South Carolina, is 83.1°F (28.4°C), while the average low-temperature is 61.9°F (16.6°C).

How many days does it rain in May in Charleston?

In Charleston, South Carolina, in May, it is raining for 7.8 days, with typically 3" (76.7mm) of accumulated precipitation.
Average temperature in May - Charleston, SC
  • Average high temperature in May: 28.4°C

The warmest month (with the highest average high temperature) is July (32.8°C).
The month with the lowest average high temperature is January (15°C).

  • Average low temperature in May: 16.6°C

The month with the highest average low temperature is July (22.8°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).

Average humidity in May - Charleston, SC
  • Average humidity in May: 72.5%

The month with the highest relative humidity is August (78.9%).
The month with the lowest relative humidity is February (67.4%).

Average rainfall in May - Charleston, SC
  • Average rainfall in May: 76.7mm

The wettest month (with the highest rainfall) is August (181.6mm).
The driest month (with the lowest rainfall) is November (61.7mm).

Average rainfall days in May - Charleston, SC
  • Average rainfall days in May: 7.8 days

The month with the highest number of rainy days is August (13.2 days).
The month with the lowest number of rainy days is November (7 days).

Average snowfall in May - Charleston, SC
  • Average snowfall in May: 0mm

The month with the highest snowfall is December (12.7mm).
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October and November (0mm).

Average snowfall days in May - Charleston, SC
  • Average snowfall days in May: 0 days

Months with the highest number of snowfall days are February and December (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average sea temperature in May - Charleston, SC
  • Average sea temperature in May: 22.8°C

The best month for swimming (with the highest average sea temperature) is August (28.6°C).
The coldest month (with the lowest average sea temperature) is February (16.7°C).

Average daylight in May / Average sunshine in May - Charleston, SC
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 9.5h

The month with most sunshine is May (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 5.5h).

Average UV index in May - Charleston, SC
  • Average UV index in May: 9

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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