August weather forecast
Port Saint Lucie, FL

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A small wooden gazebo over a natural preserve in Port Saint Lucie, Florida
A small wooden gazebo over a natural preserve in Port Saint Lucie, Florida

Weather in August

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.
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Frequently asked questions

What is the hottest time of year in Port Saint Lucie?

Temperature records in Port Saint Lucie, Florida, mark August as the warmest month, with highs averaging 87.6°F (30.9°C) and lows at 78.4°F (25.8°C).

Is it hot in Port Saint Lucie during August?

In Port Saint Lucie, in August, the average high-temperature is 87.6°F (30.9°C), and the average low-temperature is 78.4°F (25.8°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 104°F (40°C).

What are the most humid months in Port Saint Lucie?

June through September, with an average relative humidity of 78%, are most humid months.

What is the average humidity in August in Port Saint Lucie?

In August, the average relative humidity in Port Saint Lucie is 78%.

What is the rainiest month in Port Saint Lucie?

The month with the most rainfall in Port Saint Lucie, Florida, is August, when the rain falls for 23.5 days and typically aggregates up to 2.99" (76mm) of precipitation.

How much does it rain in Port Saint Lucie in August?

In August, in Port Saint Lucie, Florida, the rain falls for 23.5 days. Throughout August, 2.99" (76mm) of precipitation is accumulated.

When is the ocean warmest in Port Saint Lucie?

With an average ocean temperature of 85.1°F (29.5°C), August is the month with the warmest seawater.

What is the ocean temperature in August in Port Saint Lucie?

In Port Saint Lucie, Florida, in August, the average water temperature is 85.1°F (29.5°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Port Saint Lucie have in August?

The average day length in August in Port Saint Lucie, Florida, is 13h and 5min.

What time are sunrise and sunset in August in Port Saint Lucie?

In August, on the first day of the month, sunrise is at 6:45 am and sunset at 8:09 pm. On the last day of the month, in Port Saint Lucie, Florida, sunrise is at 7:00 am and sunset at 7:42 pm EDT.

How many hours of sunshine does Port Saint Lucie have in August?

In Port Saint Lucie, the average sunshine duration in August is 10.8h.

When is the highest UV index in Port Saint Lucie?

The months with the highest UV index in Port Saint Lucie, Florida, are May through September, with an average maximum UV index of 7.

What is the UV index intensity in August in Port Saint Lucie?

In Port Saint Lucie, the average daily maximum UV index in August is 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.

Average temperature in August
Port Saint Lucie, FL

Average temperature in August - Port Saint Lucie, FL
  • Average high temperature in August: 87.6°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (71.2°F).

  • Average low temperature in August: 78.4°F

The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

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Average pressure in August
Port Saint Lucie, FL

Average pressure in August - Port Saint Lucie, FL
  • Average pressure in August: 29.99"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).

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Average wind speed in August
Port Saint Lucie, FL

Average wind speed in August - Port Saint Lucie, FL
  • Average wind speed in August: 6.6mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in August
Port Saint Lucie, FL

Average humidity in August - Port Saint Lucie, FL
  • Average humidity in August: 78%

The months with the highest relative humidity are June, July, August and September (78%).
The month with the lowest relative humidity is March (71%).

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Average rainfall in August
Port Saint Lucie, FL

Average rainfall in August - Port Saint Lucie, FL
  • Average rainfall in August: 2.99"

The wettest month (with the highest rainfall) is August (2.99").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in August
Port Saint Lucie, FL

Average rainfall days in August - Port Saint Lucie, FL
  • Average rainfall days in August: 23.5 days

The month with the highest number of rainy days is August (23.5 days).
The month with the least rainy days is January (8.2 days).

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Average sea temperature in August
Port Saint Lucie, FL

Average sea temperature in August - Port Saint Lucie, FL
  • Average sea temperature in August: 85.1°F

The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (73.3°F).

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Average daylight in August /
Average sunshine in August
Port Saint Lucie, FL

Average daylight in August / Average sunshine in August - Port Saint Lucie, FL
  • Average daylight in August: 13h and 1min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in August: 10h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 6min).

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Average sunshine days in August
Port Saint Lucie, FL

Average sunshine days in August - Port Saint Lucie, FL
  • Average sunshine days in August: 3.8 days

The month with the most sunshine days is January (18.7 days).
The month with the least sunshine days is August (3.8 days).

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Average UV index in August
Port Saint Lucie, FL

Average UV index in August - Port Saint Lucie, FL
  • Average UV index in August: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).

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Average cloud cover in August
Port Saint Lucie, FL

Average cloud cover in August - Port Saint Lucie, FL
  • Average cloud cover in August: 27

The months with the most cloud cover are November and December (Cloud cover 34).
The months with the least cloud cover are May, July and August (Cloud cover 27).

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Average visibility in August
Port Saint Lucie, FL

Average visibility in August - Port Saint Lucie, FL
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Port Saint Lucie, Florida, USA

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