The highest day temperature in August 2025 was 95°F. The lowest night temperature was 78°F. The average values for day and night temperatures during August were 88.8°F и 83.4°F respectivly.

The average sea surface temperature in August 2025 for St. Simons Island was 89.7°F. The maximum and minimum values were 87.2°F and 91.8°F respectively.

Most of the days in August are cloudy but you can also expect sunny or gloomy days.

Precipitation total in August for St. Simons Island is 2.4 in. It makes august the most rainy month of the year.

The average wind speed in August is 6.0 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 St. Simons Island in August is 6.5 hours.