The highest day temperature in July 2026 was 99°F. The lowest night temperature was 80°F. The average values for day and night temperatures during July were 95.1°F и 84.4°F respectivly.

The average sea surface temperature in July 2026 for Charleston was 89.8°F. The maximum and minimum values were 88.2°F and 91.2°F respectively.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Charleston is 4.3 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 8.3 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 July is 9.0 hours.