The highest day temperature in August 2025 was 103°F. The lowest night temperature was 77°F. The average values for day and night temperatures during August were 95.8°F и 80.4°F respectivly.

The average sea surface temperature in August 2025 for Port St. Lucie was 89.4°F. The maximum and minimum values were 87.6°F and 91.2°F respectively.

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

Precipitation total in August for Port St. Lucie is 1.5 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 8.5 mph. It makes August one of the most windless months of the year for Port St. Lucie.

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 Port St. Lucie in August is 6.5 hours.