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 advent of September brings an average high-temperature of a still moderately hot 84.4°F (29.1°C), exhibiting minor difference from the previous month. Registering an almost steady temperature, Big Coppitt Key's nights in September see an average low of 82.2°F (27.9°C).Heat index
For most parts of September, the heat index is computed to be a tropical 93.2°F (34°C). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. 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 extremely vital to babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
July through September, with an average relative humidity of 74%, are the least humid months.Rainfall
September is the month with the most rainfall. Rain falls for 20.8 days and accumulates 3.54" (90mm) of precipitation.Ocean temperature
In September, the average ocean temperature is 85.6°F (29.8°C).Note: For any water activity, the surface water temperatures in the range of 77°F (25°C) to 84.2°F (29°C) are deemed excellent and incredibly pleasant for longer durations.
Daylight
In September, the average length of the day in Big Coppitt Key is 12h and 17min.On the first day of the month, sunrise is at 7:08 am and sunset at 7:44 pm. On the last day of September, in Big Coppitt Key, sunrise is at 7:18 am and sunset at 7:14 pm EDT.
Sunshine
In Big Coppitt Key, 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 Big Coppitt Key. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 7 during September, leads to the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Big Coppitt Key?
What are the least humid months in Big Coppitt Key?
What is the average humidity in September in Big Coppitt Key?
What is the wettest month in Big Coppitt Key?
How much does it rain in Big Coppitt Key in September?
What is the ocean temperature in September in Big Coppitt Key?
What is the average length of the day in September in Big Coppitt Key?
When are sunrise and sunset in September in Big Coppitt Key?
How long on average sun shines in September in Big Coppitt Key?
When is the highest UV index in Big Coppitt Key?
What is the UV index intensity in September in Big Coppitt Key?
Average temperature in September
Big Coppitt Key, FL
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (72.7°F).
- Average low temperature in September: 82.2°F
The month with the highest average low temperature is August (83.1°F).
The coldest month (with the lowest average low temperature) is January (68.5°F).
Average pressure in September
Big Coppitt Key, FL
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are September and October (29.93"Hg).
Average wind speed in September
Big Coppitt Key, FL
- Average wind speed in September: 10.1mph
The windiest month (with the highest average wind speed) is November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.4mph).
Average humidity in September
Big Coppitt Key, FL
- Average humidity in September: 74%
The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are July, August and September (74%).
Average rainfall in September
Big Coppitt Key, FL
- Average rainfall in September: 3.54"
The wettest month (with the highest rainfall) is September (3.54").
The driest month (with the least rainfall) is March (0.43").
Average rainfall days in September
Big Coppitt Key, FL
- Average rainfall days in September: 20.8 days
The month with the highest number of rainy days is September (20.8 days).
The month with the least rainy days is March (9.4 days).
Average sea temperature in September
Big Coppitt Key, FL
- Average sea temperature in September: 85.6°F
The best month for swimming (with the highest average sea temperature) is August (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).
Average daylight in September /
Average sunshine in September
Big Coppitt Key, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 36min).
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 30min).
Average sunshine days in September
Big Coppitt Key, FL
- Average sunshine days in September: 6.2 days
The month with the most sunshine days is March (19.6 days).
The month with the least sunshine days is September (6.2 days).
Average UV index in September
Big Coppitt 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
Big Coppitt Key, FL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).
Average visibility in September
Big Coppitt 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).
Big Coppitt Key, Florida, USA
Weather forecast for your location
2. Allow the app to use your location