September weather forecast and climate
Cayo Costa, FL

Weather in September

The first month of the autumn, September, is also a hot month in Cayo Costa, Florida, with temperature in the range of an average high of 86.7°F (30.4°C) and an average low of 79°F (26.1°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 86.7°F (30.4°C). In Cayo Costa, in September, the average low-temperature is 79°F (26.1°C).

Heat index

In September, the average heat index is appraised at a torrid 99.3°F (37.4°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like metabolic differences, differences in body mass, height, and shape, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In September, the average relative humidity in Cayo Costa is 75%.

Rainfall

In Cayo Costa, Florida, during 19.5 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, in Cayo Costa, there are 122 rainfall days, and 8.98" (228mm) of precipitation is accumulated.

Daylight

The average length of the day in Cayo Costa is 12.3h.

Sunshine

In Cayo Costa, the average sunshine in September is 9.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Cayo Costa. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Cayo Costa?

The average high-temperature, in September, is 86.7°F (30.4°C), while the average low-temperature is 79°F (26.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, in September is evaluated at 99.3°F (37.4°C).

What is the average humidity in September in Cayo Costa?

In September, the average relative humidity is 75%.

How many days does it rain in September in Cayo Costa?

In Cayo Costa, in September, during 19.5 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

How many hours of daylight does Cayo Costa have in September?

In Cayo Costa, the average length of the day in September is 12.3h.

How many hours of sunshine does Cayo Costa have in September?

The average sunshine in September is 9.1h.

What is the month with the highest UV index in Cayo Costa?

Months with the highest UV index in Cayo Costa are May through September, with an average maximum UV index of 7.

What is the UV index intensity in September in Cayo Costa?

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Cayo Costa, FL

Average temperature in September - Cayo Costa, FL
  • Average high temperature in September: 86.7°F

The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (70°F).

  • Average low temperature in September: 79°F

The month with the highest average low temperature is August (81°F).
The coldest month (with the lowest average low temperature) is January (58.8°F).

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Average pressure in September
Cayo Costa, FL

Average pressure in September - Cayo Costa, FL
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is January (30.12").
The month with the lowest atmospheric pressure is September (29.95").

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Average wind speed in September
Cayo Costa, FL

Average wind speed in September - Cayo Costa, FL
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are October and November (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

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Average humidity in September
Cayo Costa, FL

Average humidity in September - Cayo Costa, FL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (72%).

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Average rainfall in September
Cayo Costa, FL

Average rainfall in September - Cayo Costa, FL
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is March (0.16").

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Average rainfall days in September
Cayo Costa, FL

Average rainfall days in September - Cayo Costa, FL
  • Average rainfall days in September: 19.5 days

The month with the highest number of rainy days is September (19.5 days).
The month with the least rainy days is February (4.1 days).

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Average daylight in September /
Average sunshine in September
Cayo Costa, FL

Average daylight in September / Average sunshine in September - Cayo Costa, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.8h).
The month with the shortest days is December (Average daylight: 10.5h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is May (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Cayo Costa, FL

Average sunshine days in September - Cayo Costa, FL
  • Average sunshine days in September: 7.2 days

The month with the most sunshine days is January (25.1 days).
The month with the least sunshine days is September (7.2 days).

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Average UV index in September
Cayo Costa, FL

Average UV index in September - Cayo Costa, FL
  • Average UV index in September: 7

Months with the highest UV index are May, June, July, August and September (UV index 7).
Months with the lowest UV index are January and February (UV index 5).

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Average cloud cover in September
Cayo Costa, FL

Average cloud cover in September - Cayo Costa, FL
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 29).
Months with the least cloud cover are March and May (Cloud cover 23).

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Average visibility in September
Cayo Costa, FL

Average visibility in September - Cayo Costa, FL
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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