September weather forecast
Naples, FL

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Magnificent white sandy shores of Naples in Florida, USA, complete with a view of the city structure and plantation
Magnificent white sandy shores of Naples in Florida, USA, complete with a view of the city structure and plantation

Weather in September

September signifies a gradual decline in the intensity of summer in Naples. There's a slight fall in day temperatures and a lesser increase in rainfall from a high of 4.29" (109mm) in August to 2.4" (61mm). Nevertheless, The sea temperature remains high, allowing for swimming and other water-based activities. In addition, daylight hours start to decrease steadily indicating the nearing autumnal equinox. To summarise, September in Naples is a transitional month where summer starts fading out.

Temperature

The commencement of September in Naples brings an average high-temperature of a still hot 87.1°F (30.6°C), marking an inconsequential divergence from August. A slight dip in temperature to a moderately hot 78.4°F (25.8°C) marks the average nights during September.

Heat index

The heat index in September is appraised at a torrid 100.4°F (38°C). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Naples, during September, the rain falls for 21.5 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in Naples, there are 162.1 rainfall days, and 21.69" (551mm) of precipitation is accumulated.

Ocean temperature

In Naples, in September, the average water temperature is 85.6°F (29.8°C).
Note: Swimming, diving, and other water-related activities in temperatures between 77°F (25°C) and 84.2°F (29°C) are considered highly enjoyable and satisfying for longer durations without uneasiness.

Daylight

In September, the average length of the day is 12h and 18min.
On the first day of the month, sunrise is at 7:07 am and sunset at 7:46 pm. On the last day of September, in Naples, sunrise is at 7:19 am and sunset at 7:14 pm EDT.

Sunshine

The average sunshine in September in Naples is 9.2h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Naples. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 7 transforms into these recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. 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. Caution! The Sun's UV intensity grows with reflections off sand and water.
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Frequently asked questions

Is it hot in Naples during September?

An average high-temperature, in September, in Naples, is 87.1°F (30.6°C) and the average low-temperature is 78.4°F (25.8°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, is appraised at 100.4°F (38°C).

What is the average humidity in September in Naples?

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

How many days does it rain in September in Naples?

In Naples, in September, during 21.5 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

What is the ocean temperature in September in Naples?

In Naples, Florida, in September, the average water temperature is 85.6°F (29.8°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Naples?

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

What time are sunrise and sunset in September in Naples?

On the first day of September in Naples, sunrise is at 7:07 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:14 pm EDT.

How long on average sun shines in September in Naples?

The average sunshine duration in September in Naples, Florida, is 9.2h.

When is the highest UV index in Naples?

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

What is the UV index reading in September in Naples?

In September, the average daily maximum UV index in Naples, Florida, is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.

Average temperature in September
Naples, FL

Average temperature in September - Naples, FL
  • Average high temperature in September: 87.1°F

The warmest month (with the highest average high temperature) is August (88.3°F).
The month with the lowest average high temperature is January (71.6°F).

  • Average low temperature in September: 78.4°F

The month with the highest average low temperature is August (80.2°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

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Average pressure in September
Naples, FL

Average pressure in September - Naples, FL
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.94"Hg).

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Average wind speed in September
Naples, FL

Average wind speed in September - Naples, FL
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is November (9.2mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).

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Average humidity in September
Naples, FL

Average humidity in September - Naples, FL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is March (72%).

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Average rainfall in September
Naples, FL

Average rainfall in September - Naples, FL
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is August (4.29").
The driest month (with the least rainfall) is March (0.63").

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Average rainfall days in September
Naples, FL

Average rainfall days in September - Naples, FL
  • Average rainfall days in September: 21.5 days

The month with the highest number of rainy days is August (22.4 days).
The month with the least rainy days is February (7 days).

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Average sea temperature in September
Naples, FL

Average sea temperature in September - Naples, FL
  • Average sea temperature in September: 85.6°F

The best month for swimming (with the highest average sea temperature) is August (87.2°F).
The coldest month (with the lowest average sea temperature) is January (66.6°F).

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

Average daylight in September / Average sunshine in September - Naples, 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 months with the most sunshine are May and July (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
Naples, FL

Average sunshine days in September - Naples, FL
  • Average sunshine days in September: 7.1 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is August (6.8 days).

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Average UV index in September
Naples, FL

Average UV index in September - Naples, 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
Naples, FL

Average cloud cover in September - Naples, FL
  • Average cloud cover in September: 27

The month with the most cloud cover is January (Cloud cover 28).
The months with the least cloud cover are March and April (Cloud cover 22).

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Average visibility in September
Naples, FL

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

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