September weather forecast
Indian River Shores, FL

The first month of the autumn, September, is still a warm month in Indian River Shores, Florida, with an average temperature fluctuating between 85.5°F (29.7°C) and 77.4°F (25.2°C).

Temperature

As September takes its course, Indian River Shores's average high-temperature registers at a moderately hot 85.5°F (29.7°C), closely aligning with the preceding month. Indian River Shores maintains an average low-temperature of 77.4°F (25.2°C) throughout September's nights.

Heat index

For September, the heat index is evaluated at a very hot 96.8°F (36°C). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. 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. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital 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.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

The average relative humidity in September is 78%.

Rainfall

In Indian River Shores, during September, the rain falls for 19.6 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Indian River Shores, during the entire year, the rain falls for 153.2 days and collects up to 13.15" (334mm) of precipitation.

Ocean temperature

In Indian River Shores, the average seawater temperature in September is 84°F (28.9°C).
Note: Water activities including swimming and diving are pleasurable in temperatures between 77°F (25°C) and 84.2°F (29°C), ensuring comfort and enjoyment for extended time frames.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September in Indian River Shores, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:14 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 in Indian River Shores are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Notice! Sand and water reflections contribute to a stronger UV exposure.