The highest day temperature in July 2025 was 101°F. The lowest night temperature was 79°F. The average values for day and night temperatures during July were 93.0°F и 83.7°F respectivly.

The average sea surface temperature in July 2025 for St. Simons Island was 88.3°F. The maximum and minimum values were 85.2°F and 91.8°F respectively.

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

Precipitation total in July for St. Simons Island is 2.1 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 5.7 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 St. Simons Island in July is 7.7 hours.