September weather forecast
Captiva, FL

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Weather in September

September marks the zenith of rainfall in Captiva with 1.02". The month sees a slight dip in temperature to 86.7°F, but the rainfall brings relief to the summer blaze. Concurrently, daylight and sunshine duration decelerate. As the summer begins to fade, the weather shifts, creating a captivating blend of warmth and rain.

Temperature

Captiva experiences a minor change to a still tropical 86.7°F in average high-temperature during September, closely reflecting August. Captiva's average low temperature, barely cooler than the daytime high, steadies at a warm 79°F during September.

Heat index

September's heat index is computed to be a fiery hot 98.6°F. Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September in Captiva, Florida, is 75%.

Rainfall

In Captiva, Florida, in September, during 19.5 rainfall days, 1.02" of precipitation is typically accumulated. Throughout the year, in Captiva, there are 122 rainfall days, and 8.98" of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature is 84.2°F.
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 77°F to 84.2°F, without any unpleasant sensations for prolonged durations.

Daylight

In Captiva, Florida, the average length of the day in September is 12h and 18min.
On the first day of September, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:20 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 Captiva. A UV Index reading 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 transforms into the following instructions:
Deflect overexposure. Sun protection is a necessity. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat. Stay aware! UV radiation is magnified when reflecting off sand and water.
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FAQ

Is it hot in Captiva during September?

Captiva in September has an average high-temperature of 86.7°F and an average low-temperature of 79°F. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 98.6°F.

What is the average humidity in September in Captiva?

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

How much does it rain in Captiva in September?

In Captiva, in September, it is raining for 19.5 days, with typically 1.02" of accumulated precipitation.

What is the water temperature in September in Captiva?

In September, the average ocean temperature in Captiva, Florida, is 84.2°F. Water temperature between 77°F and 84.2°F is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Captiva have in September?

In September, the average day length is 12h and 18min.

When is the sunrise / sunset in September in Captiva?

On the first day of September in Captiva, Florida, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:16 pm EDT.

How many hours of sunshine does Captiva have in September?

In September, the average sunshine duration is 9.1h.

What is the month with the highest UV index in Captiva?

May through September, with an average maximum UV index of 7, are months with the highest UV index in Captiva, Florida.

What is the UV index reading in September in Captiva?

In Captiva, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Captiva, FL

Average temperature in September - Captiva, 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
Captiva, FL

Average pressure in September - Captiva, 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
Captiva, FL

Average wind speed in September - Captiva, 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
Captiva, FL

Average humidity in September - Captiva, 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
Captiva, FL

Average rainfall in September - Captiva, 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
Captiva, FL

Average rainfall days in September - Captiva, 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 sea temperature in September
Captiva, FL

Average sea temperature in September - Captiva, FL
  • Average sea temperature in September: 84°F

The best month for swimming (with the highest average sea temperature) is August (86°F).
The coldest month (with the lowest average sea temperature) is February (70°F).

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Average daylight in September /
Average sunshine in September
Captiva, FL

Average daylight in September / Average sunshine in September - Captiva, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in September: 9h and 1min

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
Captiva, FL

Average sunshine days in September - Captiva, 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
Captiva, FL

Average UV index in September - Captiva, 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
Captiva, FL

Average cloud cover in September - Captiva, 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
Captiva, FL

Average visibility in September - Captiva, 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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Captiva, Florida, USA

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