September weather forecast
Iona, FL

The first month of the autumn, September, is still a hot month in Iona, Florida, with an average temperature varying between 77.5°F (25.3°C) and 87.3°F (30.7°C).

Temperature

September ushers in an average high-temperature of a still tropical 87.3°F (30.7°C), aligning closely with the preceding month. September nights are marked by an average low-temperature of 77.5°F (25.3°C).

Heat index

The average heat index in September is estimated at a fiery hot 102.2°F (39°C). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

The months with the highest humidity are September and December, with an average relative humidity of 76%.

Rainfall

In Iona, in September, during 21.2 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Iona, during the entire year, the rain falls for 156.4 days and collects up to 17.95" (456mm) of precipitation.

Ocean temperature

In Iona, the average seawater temperature in September is 84.9°F (29.4°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

In Iona, the average length of the day in September is 12h and 18min.
On the first day of September, sunrise is at 7:07 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:15 pm EDT.

Sunshine

In Iona, 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 of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, an average UV index of 7 transforms into the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.