September weather forecast
Harbor Bluffs, FL

The first month of the autumn, September, is also a hot month in Harbor Bluffs, Florida, with an average temperature fluctuating between 86.2°F (30.1°C) and 77.9°F (25.5°C).

Temperature

September commences with an average high-temperature of a still tropical 86.2°F (30.1°C), showing little deviation from August's 87.6°F (30.9°C). Harbor Bluffs navigates through September with a barely noticeable decrease in temperature at night, stabilizing at a moderately hot 77.9°F (25.5°C).

Heat index

For most parts of September, the heat index is evaluated at a sweltering 96.8°F (36°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The average relative humidity in September in Harbor Bluffs is 74%.

Rainfall

In Harbor Bluffs, Florida, in September, it is raining for 20.7 days, with typically 2.17" (55mm) of accumulated precipitation. Throughout the year, in Harbor Bluffs, there are 149.9 rainfall days, and 16.18" (411mm) of precipitation is accumulated.

Ocean temperature

In Harbor Bluffs, the average seawater temperature in September is 84.7°F (29.3°C).
Note: For any water activity, having surface water temperatures from 77°F (25°C) to 84.2°F (29°C) is considered outstanding and highly delightful for lengthened periods.

Daylight

The average length of the day in September in Harbor Bluffs, Florida, is 12h and 19min.
On the first day of the month, sunrise is at 7:10 am and sunset at 7:51 pm. On the last day of September, in Harbor Bluffs, Florida, sunrise is at 7:23 am and sunset at 7:18 pm EDT.

Sunshine

In Harbor Bluffs, the average sunshine in September is 9.1h.

UV index

The months with the highest UV index in Harbor Bluffs are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, an average UV index of 7 transforms into the following instructions:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.