September weather forecast
Cayo Costa, FL

Weather in September

September, the first month of the autumn in Cayo Costa, is still a tropical month, with an average temperature fluctuating between 86.7°F (30.4°C) and 79°F (26.1°C).

Temperature

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

Heat index

The average heat index in September is computed to be a torrid 98.6°F (37°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, differences in body mass, height, and shape, metabolic differences, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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 cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in September in Cayo Costa is 75%.

Rainfall

In September, the rain falls for 19.5 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. Throughout the year, there are 122 rainfall days, and 8.98" (228mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Cayo Costa, Florida, is 12h and 18min.
On the first day of September in Cayo Costa, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:16 pm EDT.

Sunshine

In September, the average sunshine 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 estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Cayo Costa?

The average high-temperature, in September, in Cayo Costa, Florida, is 86.7°F (30.4°C), while the average low-temperature is 79°F (26.1°C). in September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 98.6°F (37°C).

What is the average humidity in September in Cayo Costa?

The average relative humidity in September is 75%.

How much does it rain in Cayo Costa in September?

In Cayo Costa, during September, the rain falls for 19.5 days and regularly aggregates up to 1.02" (26mm) of precipitation.

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

The average day length in September is 12h and 18min.

When are sunrise and sunset in September in Cayo Costa?

On the first day of September in Cayo Costa, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:16 pm EDT.

How long on average sun shines in September in Cayo Costa?

The average sunshine duration in September in Cayo Costa, Florida, is 9.1h.

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

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

How high is the UV index in September in Cayo Costa?

In September, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 12h and 18min

The month with the longest days is June (Average daylight: 13h and 47min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in September: 9h and 6min

The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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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

The months with the highest UV index are May, June, July, August and September (UV index 7).
The 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).
The 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

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).

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