Charleston
South Carolina, USA
Long-term weather forecast
Long-term weather forecast

August 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
  • The average high temperature in August: 31.9°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).

  • The average low temperature in August: 22.4°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).

  • The average humidity in August: 78.9%

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

  • The average rainfall in August: 181.6mm

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

  • The average rainfall days in August: 13.2 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).

  • The average snowfall in August: 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).

  • The average snowfall days in August: 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).

  • The average sea temperature in August: 29°C

The best month for swimming (with the highest average sea temperature) is August (29°C).
Coldest months (with the lowest average sea temperature) are January, February and March (21°C).

  • The average daylight in August: 13h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in August: 8.3h

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

  • The average UV index in August: 10

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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