The highest day temperature in August 2025 was 100°F. The lowest night temperature was 76°F. The average values for day and night temperatures during August were 93.4°F и 81.7°F respectivly.

The average sea surface temperature in August 2025 for Jacksonville was 88.8°F. The maximum and minimum values were 86.8°F and 90.2°F respectively.

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

Precipitation total in August for Jacksonville is 4.0 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 6.6 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 Jacksonville in August is 7.3 hours.