September weather forecast
Fort Myers Shores, FL

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

Temperature

The transition into September marks the average high-temperature at a still hot 87.6°F (30.9°C), differing minimally from August's 89.4°F (31.9°C). Fort Myers Shores in September experiences a low-temperature average of 76.6°F (24.8°C).

Heat index

The heat index value for September is estimated at a fiery hot 102.2°F (39°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Heat index determinations are made taking into account the shade and light air movements. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

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

Rainfall

In Fort Myers Shores, in September, during 20.9 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. Throughout the year, in Fort Myers Shores, Florida, there are 159.2 rainfall days, and 23.54" (598mm) of precipitation is accumulated.

Daylight

In Fort Myers Shores, the average length of the day in September is 12h and 18min.
On the first day of September, sunrise is at 7:06 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:14 pm EDT.

Sunshine

In Fort Myers Shores, 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 hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.