September weather forecast
Harbor Bluffs, FL

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

Temperature

September experiences an average high-temperature of a still tropical 86.2°F (30.1°C), barely different from August's 87.6°F (30.9°C). Harbor Bluffs's average nighttime temperature in September modestly descends to a warm 77.9°F (25.5°C).

Heat index

The heat index value for September is appraised at a fiery hot 96.8°F (36°C). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in September is 74%.

Rainfall

In Harbor Bluffs, in September, it is raining for 20.7 days, with typically 2.17" (55mm) of accumulated precipitation. In Harbor Bluffs, during the entire year, the rain falls for 149.9 days and collects up to 16.18" (411mm) of precipitation.

Ocean temperature

In Harbor Bluffs, in September, the average water temperature is 84.7°F (29.3°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

In September, the average length of the day 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, sunrise is at 7:23 am and sunset at 7:18 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Deter overexposure. Protecting against the sun's effects is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Stay cautious! Sand and water reflections increase UV radiation potency.