The highest day temperature in August 2026 was 101°F. The lowest night temperature was 78°F. The average values for day and night temperatures during August were 93.1°F и 83.5°F respectivly.

The average sea surface temperature in August 2026 for Charleston was 89.3°F. The maximum and minimum values were 87.4°F and 91.8°F respectively.

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

Precipitation total in August for Charleston is 5.5 in. It makes august the most rainy month of the year.

The average wind speed in August is 7.7 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 7.7 hours.