September weather forecast
Port Saint Lucie, FL

September in Port Saint Lucie signifies a gentle retreat from the summer heat, visible in the slight decrement in temperature values. The city's climate remains fairly warm, although the nights become cooler, reminiscent of the approaching, milder seasons. The majority of daylight hours for this month still enjoy abundant sunshine, despite the gradual shortening day-length. On the other hand, the frequency of rainy days during this month drops significantly when compared to August. As the city moves into October, further decreases in temperature and rainfall can be anticipated.

Temperature

Port Saint Lucie, Florida, notes an average high-temperature of a moderately hot 85.8°F (29.9°C) in September, hardly diverging from August. Port Saint Lucie, during September nights, observes a steady temperature, averaging at 77.4°F (25.2°C).

Heat index

The heat index value for September is evaluated at a fiery hot 98.6°F (37°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', comes about by integrating the temperature readings with the humidity levels. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

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

Rainfall

In September, in Port Saint Lucie, Florida, the rain falls for 21.9 days. Throughout September, 1.81" (46mm) of precipitation is accumulated. Throughout the year, in Port Saint Lucie, there are 181.5 rainfall days, and 18.11" (460mm) of precipitation is accumulated.

Ocean temperature

In Port Saint Lucie, the average seawater temperature in September is 84.4°F (29.1°C).
Note: Water activities including swimming and diving are pleasurable in temperatures between 77°F (25°C) and 84.2°F (29°C), ensuring comfort and enjoyment for extended time frames.

Daylight

The average length of the day in September in Port Saint Lucie is 12h and 19min.
On the first day of September in Port Saint Lucie, Florida, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

Sunshine

The average sunshine in September in Port Saint Lucie, Florida, is 9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: A maximum daily UV index of 7 during September morphs into the following directions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be mindful! Sand and water reflections can up the Sun's UV exposure.