September weather forecast
North Fort Myers, FL

The first month of the autumn, September, is also a hot month in North Fort Myers, Florida, with an average temperature varying between 76.6°F (24.8°C) and 87.6°F (30.9°C).

Temperature

As August transitions into September, the average high-temperature rests at a still tropical 87.6°F (30.9°C), maintaining a close resemblance to the previous month. During September, the average low-temperature is a warm 76.6°F (24.8°C).

Heat index

September's average heat index is appraised at a sweltering 102.2°F (39°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

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

Rainfall

In September, in North Fort Myers, the rain falls for 20.9 days. Throughout September, 2.95" (75mm) of precipitation is accumulated. In North Fort Myers, during the entire year, the rain falls for 159.2 days and collects up to 23.54" (598mm) of precipitation.

Ocean temperature

In North Fort Myers, in September, the average water temperature is 84.9°F (29.4°C).
Note: Water activities including swimming and diving at temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

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 7:19 am and sunset at 7:14 pm EDT.

Sunshine

The average sunshine in September is 9.2h.

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 vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Shield from overexposure. Defense against sun-related harm is required. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Caution! Sand and water reflections can notably increase the UV radiation intensity.