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Climate · Charleston

Charleston in August

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

August in Charleston is hot: highs near 89°F, lows near 77°F. Rain falls on about five days a week, and the days shorten by 51 minutes from the first week to the last.August in Charleston is hot: highs near 32°C, lows near 25°C. Rain falls on about five days a week, and the days shorten by 51 minutes from the first week to the last.

High
89°F32°Caverage
Low
77°F25°Caverage
Wet days
5a week · 67% of days
Daylight
13h 19mon average

Is August a good time to visit Charleston?

August sits outside Charleston's best months, which run in two parts: April, or October to November. Expect hot days and rain on about five days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How August sits in the year

week by week

Temperature

Highs near 89°F in August, against 62°F to 90°F through the year.Highs near 32°C in August, against 17°C to 32°C through the year.

Chance of a wet day

67% of days in August, against 24% to 67% through the year.

Cloud cover

54% cover in August, against 38% to 57% through the year.

Daylight

13h 19m in August, against 10h 01m to 14h 16m through the year.

Week by week, lightly smoothed, with August shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. July90°32°low 77°low 25°4 wet days a weekRain on about four days a week.
  2. August89°32°low 77°low 25°5 wet days a weekRain on about five days a week.
  3. September85°29°low 73°low 23°4 wet days a weekRain on about four days a week.

Where Charleston sits, in August

America/New York
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
6:43 AMsets 8:07 PM
Above the sea
0 mlow-lying
Latitude
32.8°Nnorthern hemisphere
Nearest of ours
Bluffton106 km south-west

The land around Charleston, shaded by its typical high in August, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in August

high · low · wet days
See August on the planning mapThe whole year in Charleston

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Charleston. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.