The highest day temperature in December 2025 was 70°F. The lowest night temperature was 28°F. The average values for day and night temperatures during December were 57.7°F и 49.3°F respectivly.

The average sea surface temperature in December 2025 for Kiawah Island was 56.8°F. The maximum and minimum values were 52.2°F and 61.8°F respectively.

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

Precipitation total in December for Kiawah Island is 0.9 in. It makes december one of the least rainy months of the year.

The average wind speed in December is 8.5 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 Kiawah Island in December is 5.9 hours.