September weather forecast
Atlantis, FL

Weather in September

The first month of the autumn, September, is also a moderately hot month in Atlantis, Florida, with an average temperature fluctuating between 85.1°F (29.5°C) and 80.1°F (26.7°C).

Temperature

In Atlantis, the average high-temperature in September is practically the same as in August - a warm 85.1°F (29.5°C). In September, in Atlantis, the average low-temperature is 80.1°F (26.7°C).

Heat index

The average heat index in September is estimated at a very hot 95°F (35°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 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like wind, metabolic differences, pregnancy, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. 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 Atlantis is 75%.

Rainfall

In Atlantis, Florida, during September, the rain falls for 26.8 days and regularly aggregates up to 7.48" (190mm) of precipitation. Throughout the year, there are 238.3 rainfall days, and 54.53" (1385mm) of precipitation is accumulated.

Daylight

In Atlantis, the average length of the day in September is 12h and 18min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:12 am and sunset at 7:08 pm EDT.

Sunshine

In Atlantis, the average sunshine in September is 8.9h.

UV index

The months with the highest UV index in Atlantis, Florida, are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. 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 Atlantis?

In Atlantis, in September, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 80.1°F (26.7°C). in September, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is estimated at 95°F (35°C).

What is the average humidity in September in Atlantis?

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

How much does it rain in Atlantis in September?

In Atlantis, Florida, in September, it is raining for 26.8 days, with typically 7.48" (190mm) of accumulated precipitation.

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

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

When is the sunrise / sunset in September in Atlantis?

On the first day of September in Atlantis, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:08 pm EDT.

How many hours of sunshine does Atlantis have in September?

The average sunshine duration in September in Atlantis, Florida, is 8.9h.

When is the highest UV index in Atlantis?

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

What is the UV index intensity in September in Atlantis?

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in September
Atlantis, FL

Average temperature in September - Atlantis, FL
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is August (86.7°F).
The month with the lowest average high temperature is January (72.5°F).

  • Average low temperature in September: 80.1°F

The month with the highest average low temperature is August (81.5°F).
The coldest month (with the lowest average low temperature) is January (64°F).

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Average pressure in September
Atlantis, FL

Average pressure in September - Atlantis, FL
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).

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Average wind speed in September
Atlantis, FL

Average wind speed in September - Atlantis, FL
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is March (11.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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Average humidity in September
Atlantis, FL

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

The months with the highest relative humidity are June and December (76%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in September
Atlantis, FL

Average rainfall in September - Atlantis, FL
  • Average rainfall in September: 7.48"

The wettest month (with the highest rainfall) is August (9.06").
The driest month (with the least rainfall) is January (1.3").

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Average rainfall days in September
Atlantis, FL

Average rainfall days in September - Atlantis, FL
  • Average rainfall days in September: 26.8 days

The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (13.3 days).

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

Average daylight in September / Average sunshine in September - Atlantis, 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: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Atlantis, FL

Average sunshine days in September - Atlantis, FL
  • Average sunshine days in September: 2.8 days

The month with the most sunshine days is March (12.7 days).
The month with the least sunshine days is July (2.3 days).

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Average UV index in September
Atlantis, FL

Average UV index in September - Atlantis, 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 month with the lowest UV index is January (UV index 5).

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Average cloud cover in September
Atlantis, FL

Average cloud cover in September - Atlantis, FL
  • Average cloud cover in September: 32

The months with the most cloud cover are January, October, November and December (Cloud cover 36).
The months with the least cloud cover are April and July (Cloud cover 29).

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Average visibility in September
Atlantis, FL

Average visibility in September - Atlantis, 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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