September weather forecast
Iona, FL

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

Temperature

Entering September, the average high-temperature is recorded at a still hot 87.3°F (30.7°C), exhibiting a minimal shift from August's 88.9°F (31.6°C). Throughout the nights in September, an average low-temperature of 77.5°F (25.3°C) is noted.

Heat index

September's heat index is evaluated at a sweltering 102.2°F (39°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

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

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 September, the average ocean temperature is 84.9°F (29.4°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.

Daylight

In September, the average length of the day 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 estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Warning! The Sun's UV rays intensify with reflections from sand and water.