September weather forecast
Cape Coral, FL

Cape Coral greets September by gradually transitioning from summer to autumn. Significantly, it continues with the same high rainfall, registering 2.6" (66mm) distributed over 21.2 days. Despite the decreasing day length and declining sea temperatures, September maintains a warm and humid environment. The active sea breeze in mid-September escorts the continual transition into autumn. The reduced sunshine hours subtly hint at the approaching winter season.

Temperature

The transition from August to September sees average high-temperatures adjusting to a still tropical 87.3°F (30.7°C), from a not significantly different 88.9°F (31.6°C). An average minimum temperature of 77.5°F (25.3°C) is recorded in Cape Coral during the month of September.

Heat index

September's average heat index is estimated at a sweltering 102.2°F (39°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is derived by integrating air temperature with the existing relative humidity to express the 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. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

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

Rainfall

In Cape Coral, during September, the rain falls for 21.2 days and regularly aggregates up to 2.6" (66mm) of precipitation. Throughout the year, in Cape Coral, there are 156.4 rainfall days, and 17.95" (456mm) of precipitation is accumulated.

Ocean temperature

In Cape Coral, in September, the average water temperature is 84.9°F (29.4°C).
Note: For any water activity, the surface water temperatures in the range of 77°F (25°C) to 84.2°F (29°C) are deemed excellent and incredibly pleasant for longer durations.

Daylight

The average length of the day in September in Cape Coral 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 7:14 pm EDT.

Sunshine

In September, the average sunshine in Cape Coral is 9.1h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.