September weather forecastBiscayne Park, FL

Weather in September

September, the first month of the autumn in Biscayne Park, is still a hot month, with an average temperature ranging between max 86.4°F (30.2°C) and min 80.6°F (27°C).

Temperature

During September, Biscayne Park observes a subtle ascent to a still hot 86.4°F (30.2°C) from August's 88°F (31.1°C) in the average high-temperature. Consistently, Biscayne Park reports average nighttime temperatures of 80.6°F (27°C) during September, a marginal step down from its daytime highs.

Heat index

For September, the heat index is appraised at a torrid 96.8°F (36°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. 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. 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 particularly important for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Biscayne Park, the average relative humidity in September is 73%.

Rainfall

In Biscayne Park, during September, the rain falls for 21.3 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Biscayne Park, during the entire year, the rain falls for 166.7 days and collects up to 12.91" (328mm) of precipitation.

Daylight

The average length of the day in September is 12h and 18min.
On the first day of the month, sunrise is at 7:01 am and sunset at 7:39 pm. On the last day of September, in Biscayne Park, sunrise is at 7:12 am and sunset at 7:08 pm EDT.

Sunshine

In September, the average sunshine is 9h.

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 unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.