September weather forecast
Darby, FL

The first month of the autumn, September, is still a tropical month in Darby, Florida, with an average temperature fluctuating between 74.3°F (23.5°C) and 88.3°F (31.3°C).

Temperature

September's advent notes a subtle adjustment in average high-temperature to a still tropical 88.3°F (31.3°C) from August. During September, Darby observes a consistent average nighttime temperature of 74.3°F (23.5°C).

Heat index

The heat index value during September is estimated at a blistering 105.8°F (41°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Heat index data is primarily for areas with shade and subjected to light winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The months with the highest humidity are July through September, with an average relative humidity of 77%.

Rainfall

In Darby, Florida, in September, it is raining for 18.7 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, there are 155.3 rainfall days, and 18.62" (473mm) of precipitation is accumulated.

Daylight

In Darby, the average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:08 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:22 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. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 7 transforms into these recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.