September weather forecast
Riverdale, FL

September, the first month of the autumn in Riverdale, is still a hot month, with an average temperature ranging between max 88.2°F (31.2°C) and min 72.9°F (22.7°C).

Temperature

Upon the onset of September, Riverdale witnesses an average high-temperature of a still tropical 88.2°F (31.2°C), showing a close resemblance to the prior month. Riverdale throughout September, records an average low-temperature of 72.9°F (22.7°C).

Heat index

The average heat index in September is estimated at a blisteringly hot 105.8°F (41°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

July through September, with an average relative humidity of 79%, are the most humid months.

Rainfall

In September, the rain falls for 15.9 days. Throughout September, 1.46" (37mm) of precipitation is accumulated. In Riverdale, during the entire year, the rain falls for 140.2 days and collects up to 15" (381mm) of precipitation.

Daylight

In Riverdale, the average length of the day in September is 12h and 19min.
On the first day of September in Riverdale, sunrise is at 7:07 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:15 pm EDT.

Sunshine

In Riverdale, Florida, the average sunshine in September is 8.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Riverdale, Florida. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: A daily high UV index of 7 in September leads to these guidelines:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. 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. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.