September weather forecast
Merritt Island, FL

The first month of the autumn, September, is still a warm month in Merritt Island, Florida, with an average temperature ranging between max 85.1°F (29.5°C) and min 77.7°F (25.4°C).

Temperature

As Merritt Island, Florida, steps into September, the average high-temperature is measured at a moderately hot 85.1°F (29.5°C), displaying minor differences from August's 87.3°F (30.7°C). Merritt Island's September nights observe a minor shift from the daytime temperatures, resulting in an average dip to 77.7°F (25.4°C).

Heat index

September's mean heat index is estimated at a sweltering 95°F (35°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Merritt Island, the average relative humidity in September is 77%.

Rainfall

In Merritt Island, during September, the rain falls for 22.5 days and regularly aggregates up to 3.58" (91mm) of precipitation. Throughout the year, there are 190.9 rainfall days, and 29.37" (746mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Merritt Island, Florida, is 12h and 19min.
On the first day of the month, sunrise is at 7:01 am and sunset at 7:43 pm. On the last day of September, in Merritt Island, sunrise is at 7:15 am and sunset at 7:09 pm EDT.

Sunshine

In September, the average sunshine in Merritt Island is 9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Merritt Island, Florida. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: In September, the UV index of 7 transforms into the following advice:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Experience reduced UV exposure by about half when donning a wide-brim hat.