September weather forecast
Highland Beach, FL

The first month of the autumn, September, is still a warm month in Highland Beach, Florida, with an average temperature varying between 85.3°F (29.6°C) and 80.2°F (26.8°C).

Temperature

September's presence records an average high-temperature of a moderately hot 85.3°F (29.6°C), closely mirroring August's climate. An average temperature of 80.2°F (26.8°C) is logged during the nights of September, a small step down from daytime highs.

Heat index

Throughout September, the heat index is calculated to be a sweltering 95°F (35°C). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. 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 are extremely significant for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In Highland Beach, the average relative humidity in September is 74%.

Rainfall

In Highland Beach, in September, during 27.8 rainfall days, 10.59" (269mm) of precipitation is typically accumulated. Throughout the year, there are 244.6 rainfall days, and 68.54" (1741mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 18min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of September, in Highland Beach, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

Sunshine

In September, the average sunshine is 9h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 7 in September transforms into this advice:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.