September weather forecast
Sunrise Key, FL

The first month of the autumn, September, is also a moderately hot month in Sunrise Key, Florida, with temperature in the range of an average low of 80.8°F (27.1°C) and an average high of 85.8°F (29.9°C).

Temperature

Sunrise Key's shift into September sets the average high-temperature at a warm 85.8°F (29.9°C), a figure that deviates only slightly from August's 87.4°F (30.8°C). Sunrise Key observes a minimal variance in temperature, with a consistent average low of 80.8°F (27.1°C) during the nights of September.

Heat index

The heat index value for September is estimated at a very hot 96.8°F (36°C). Exercise extra preventive actions, heat cramps and heat exhaustion are plausible. Continuous activity could result in heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', measures the perceived warmth when incorporating the humidity present in the air. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In Sunrise Key, the average relative humidity in September is 73%.

Rainfall

In Sunrise Key, Florida, in September, it is raining for 23.6 days, with typically 1.73" (44mm) of accumulated precipitation. In Sunrise Key, during the entire year, the rain falls for 179 days and collects up to 15.55" (395mm) of precipitation.

Daylight

In Sunrise Key, the average length of the day in September is 12h and 18min.
On the first day of September in Sunrise Key, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

Sunshine

In September, the average sunshine in Sunrise Key is 9h.

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 unsafe exposure to UV radiation for the ordinary person.
Note: In September, the maximum UV index of 7 translates into these guidelines:
Shun overexposure. Protection from sun ravages is indispensable. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.