August weather forecast
Port Saint Lucie, FL

The weather in August remains faithful to Port Saint Lucie's summer narrative, exhibiting high temperatures and extended daylight hours. This period observes the peak values for sea and air temperatures, ensuring a welcoming environment for beach-goers and sunbathers. Wind speeds during the month subside to a comfortable 6.6mph (10.6km/h) average, introducing calmer days to the city's weather. The overall weather conditions make August the ideal time for a wide range of activities, both terrestrial and aquatic. A slight decline in temperature and daylight canalizes into September, marking the transition into autumn.

Temperature

August is the warmest month of the year, registering average temperatures as high as 87.6°F (30.9°C) and as low as 78.4°F (25.8°C).

Heat index

In August, the heat index is evaluated at an extremely hot 104°F (40°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', melds the effects of warmth and moisture to generate a feeling of heat. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The months with the highest humidity in Port Saint Lucie are June through September, with an average relative humidity of 78%.

Rainfall

August is the month with the most rainfall in Port Saint Lucie. Rain falls for 23.5 days and accumulates 2.99" (76mm) of precipitation.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 85.1°F (29.5°C).
Note: Surface water temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

In August, the average length of the day is 13h and 5min.
On the first day of August in Port Saint Lucie, sunrise is at 6:45 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 7:42 pm EDT.

Sunshine

In August, the average sunshine is 10.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Port Saint Lucie. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In August, the maximum UV index of 7 translates into these guidelines:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Enhance your sun protection with tightly woven, yet airy clothing. Notice! The reflection of water and sand increases the UV radiation significantly.