September weather forecast
Riverview, FL

The first month of the autumn, September, is also a hot month in Riverview, Florida, with an average temperature ranging between min 75.4°F (24.1°C) and max 88.7°F (31.5°C).

Temperature

Riverview starts September with an average high-temperature of a still tropical 88.7°F (31.5°C), hinting at a minimal fluctuation from August. In the month of September, Riverview records a consistent average low-temperature of 75.4°F (24.1°C).

Heat index

Throughout September, the heat index is computed to be an extremely hot 105.8°F (41°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Always consider that heat index estimations are for light winds and places in the shade. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

The months with the highest humidity are September and December, with an average relative humidity of 76%.

Rainfall

In Riverview, in September, during 18.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Riverview, there are 148.4 rainfall days, and 12.32" (313mm) of precipitation is accumulated.

Daylight

The average length of the day in September in Riverview, Florida, is 12h and 19min.
On the first day of the month, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of September, in Riverview, Florida, sunrise is at 7:21 am and sunset at 7:16 pm EDT.

Sunshine

In September, the average sunshine is 9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Riverview. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.