The highest day temperature in August 2026 was 98°F. The lowest night temperature was 59°F. The average values for day and night temperatures during August were 86.9°F и 70.4°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 1.5 in. It makes august one of the most rainy months of the year.

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 7.9 hours.