The highest day temperature in August 2025 was 95°F. The lowest night temperature was 53°F. The average values for day and night temperatures during August were 84.3°F и 68.7°F respectivly.

You can expect various weather conditions during August. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in August for Charleston is 1.3 in.

The average wind speed in August is 3.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Charleston in August is 7.5 hours.