September weather forecast
Cayo Costa, FL

The first month of the autumn, September, is also a hot month in Cayo Costa, Florida, with an average temperature varying between 86.7°F (30.4°C) and 79°F (26.1°C).

Temperature

Cayo Costa's September average high-temperature settles at a still hot 86.7°F (30.4°C), showing a near match with the preceding month. A mean low-temperature of 79°F (26.1°C) is anticipated during the month of September, a slight step down from the daytime high.

Heat index

The heat index value for September is evaluated at a sweltering 98.6°F (37°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
The heat index's values are generally associated with conditions in shade and light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gives a temperature feeling by integrating air temperature and humidity. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Cayo Costa, in September, it is raining for 19.5 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 122 rainfall days, and 8.98" (228mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 18min.
On the first day of the month, sunrise is at 7:08 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:16 pm EDT.

Sunshine

In Cayo Costa, 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 in Cayo Costa. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.