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

What is the temperature in August in Charleston?

In Charleston, in August, the average high-temperature is 89.4°F (31.9°C), and the average low-temperature is 72.3°F (22.4°C).

How much does it rain in Charleston in August?

In August, in Charleston, the rain falls for 13.2 days. Throughout August, 7.1" (181.6mm) of precipitation is accumulated.

What is the wettest month in Charleston?

August is the month with the most rainfall. Rain falls for 13.2 days and accumulates 7.1" (181.6mm) of precipitation.

What is the month with the warmest sea water in Charleston?

August is the month with the warmest seawater in Charleston, with an average sea temperature of 83.5°F (28.6°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How warm is the water in August in Charleston?

In August, in Charleston, the average sea temperature is 83.5°F (28.6°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.
Average temperature in August - Charleston, SC
  • Average high temperature in August: 89.5°F

The warmest month (with the highest average high temperature) is July (91.1°F).
The month with the lowest average high temperature is January (59°F).

  • Average low temperature in August: 72.3°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (37.5°F).

Average humidity in August - Charleston, SC
  • 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%).

Average rainfall in August - Charleston, SC
  • Average rainfall in August: 7.2"

The wettest month (with the highest rainfall) is August (7.2").
The driest month (with the lowest rainfall) is November (2.4").

Average rainfall days in August - Charleston, SC
  • 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).

Average snowfall in August - Charleston, SC
  • Average snowfall in August: 0"

The month with the highest snowfall is December (0.5").
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October and November (0").

Average snowfall days in August - Charleston, SC
  • 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).

Average sea temperature in August - Charleston, SC
  • Average sea temperature in August: 83.5°F

The best month for swimming (with the highest average sea temperature) is August (83.5°F).
The coldest month (with the lowest average sea temperature) is February (61.9°F).

Average daylight in August / Average sunshine in August - Charleston, SC
  • Average daylight in August: 13.3h

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 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).

Average UV index in August - Charleston, SC
  • 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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