September weather forecast
South Miami, FL

September, the first month of the autumn in South Miami, is also a hot month, with temperature in the range of an average low of 80.6°F (27°C) and an average high of 86.9°F (30.5°C).

Temperature

The onset of September notes an average high-temperature of a still tropical 86.9°F (30.5°C), subtly shifted from August's 88.3°F (31.3°C). South Miami notes an average temperature descent to a moderately hot 80.6°F (27°C) in September, a small shift from its daytime peak.

Heat index

September's average heat index is computed to be a fiery hot 98.6°F (37°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely significant for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In September, the average relative humidity in South Miami is 72%.

Rainfall

In South Miami, Florida, in September, it is raining for 18.5 days, with typically 1.02" (26mm) of accumulated precipitation. In South Miami, Florida, during the entire year, the rain falls for 144.3 days and collects up to 10.55" (268mm) of precipitation.

Daylight

In South Miami, the average length of the day in September is 12h and 17min.
On the first day of September, sunrise is at 7:01 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

May through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 7 during September leads to these advisories:
Prevent overexposure. Protection from the sun's harmful effects is needed. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.