September weather forecastDarby, FL
September
Weather in September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Darby, FL
- Average high temperature in September: 88.3°F
The warmest month (with the highest average high temperature) is August (90.1°F).
The month with the lowest average high temperature is January (67.6°F).
- Average low temperature in September: 74.3°F
The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (50.9°F).
Average pressure in September
Darby, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in September
Darby, FL
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is March (6.8mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).
Average humidity in September
Darby, FL
- Average humidity in September: 77%
The months with the highest relative humidity are July, August and September (77%).
The months with the lowest relative humidity are January, March, April and May (72%).
Average rainfall in September
Darby, FL
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is July (3.62").
The driest months (with the least rainfall) are January and March (0.55").
Average rainfall days in September
Darby, FL
- Average rainfall days in September: 18.7 days
The month with the highest number of rainy days is August (23.2 days).
The month with the least rainy days is January (6.9 days).
Average daylight in September /
Average sunshine in September
Darby, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is May (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Darby, FL
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is January (22.7 days).
The month with the least sunshine days is July (5 days).
Average UV index in September
Darby, FL
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Darby, FL
- Average cloud cover in September: 30
The months with the most cloud cover are January, February and December (Cloud cover 33).
The month with the least cloud cover is May (Cloud cover 25).
Average visibility in September
Darby, FL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
