Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift into September finds Duck Key at an average high-temperature of a still moderately hot 84.6°F (29.2°C), closely comparable to August's conditions. Duck Key registers a steady nighttime temperature averaging a still moderately hot 82°F (27.8°C) throughout September.Heat index
The heat index in September is estimated at a hot 93.2°F (34°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.Realize that the values for the heat index are set for shaded places and light winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', provides an understanding of perceived warmth by combining temperature and relative humidity. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly meaningful for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Humidity
In September, the average relative humidity is 74%.Rainfall
The month with the most rainfall in Duck Key, Florida, is September, when the rain falls for 23 days and typically aggregates up to 4.21" (107mm) of precipitation.Ocean temperature
In September, the average ocean temperature in Duck Key, Florida, is 85.5°F (29.7°C).Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.
Daylight
The average length of the day in September in Duck Key is 12h and 17min.On the first day of September in Duck Key, sunrise is at 7:04 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:11 pm EDT.
Sunshine
The average sunshine in September is 9h.UV index
April through October, with an average maximum UV index of 7, are months with the highest UV index in Duck Key. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 7 translates into these guidelines:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Warning! The Sun's UV rays intensify with reflections from sand and water.
Frequently asked questions
How hot is September in Duck Key?
What is the average humidity in September in Duck Key?
What is the rainiest month in Duck Key?
How many days does it rain in September in Duck Key?
What is the water temperature in September in Duck Key?
What is the average length of the day in September in Duck Key?
What time are sunrise and sunset in September in Duck Key?
How many hours of sunshine does Duck Key have in September?
When is the highest UV index in Duck Key?
What is the UV index intensity in September in Duck Key?
Average temperature in September
Duck Key, FL
- Average high temperature in September: 84.6°F
The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is January (72.9°F).
- Average low temperature in September: 82°F
The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (67.5°F).
Average pressure in September
Duck Key, FL
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are September and October (29.94"Hg).
Average wind speed in September
Duck Key, FL
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (9mph).
Average humidity in September
Duck Key, FL
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is March (73%).
Average rainfall in September
Duck Key, FL
- Average rainfall in September: 4.21"
The wettest month (with the highest rainfall) is September (4.21").
The driest month (with the least rainfall) is March (0.43").
Average rainfall days in September
Duck Key, FL
- Average rainfall days in September: 23 days
The month with the highest number of rainy days is September (23 days).
The month with the least rainy days is February (10.3 days).
Average sea temperature in September
Duck Key, FL
- Average sea temperature in September: 85.4°F
The best month for swimming (with the highest average sea temperature) is August (86.6°F).
The coldest months (with the lowest average sea temperature) are January and February (73.9°F).
Average daylight in September /
Average sunshine in September
Duck Key, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Duck Key, FL
- Average sunshine days in September: 4.6 days
The month with the most sunshine days is March (18 days).
The month with the least sunshine days is September (4.6 days).
Average UV index in September
Duck Key, FL
- Average UV index in September: 7
The months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).
Average cloud cover in September
Duck Key, FL
- Average cloud cover in September: 28
The months with the most cloud cover are January and October (Cloud cover 32).
The month with the least cloud cover is April (Cloud cover 23).
Average visibility in September
Duck Key, 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).
Duck Key, Florida, USA
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