September weather forecast and climate
Atlantic Beach, FL

Weather in September

The first month of the autumn, September, is still a warm month in Atlantic Beach, Florida, with average temperature ranging between min 75.4°F (24.1°C) and max 85.8°F (29.9°C).

Temperature

In September, the average high-temperature is practically the same as in August - a moderately hot 85.8°F (29.9°C). The average low-temperature, in Atlantic Beach, is 75.4°F (24.1°C).

Heat index

In September, the average heat index is computed to be a very hot 96.8°F (36°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 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, differences in body mass, height, and shape, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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 Atlantic Beach is 75%.

Rainfall

In Atlantic Beach, Florida,, during 20 rainfall days, 4.09" (104mm) of precipitation is typically accumulated. In Atlantic Beach, during the entire year, the rain falls for 185.5 days and collects up to 31.54" (801mm) of precipitation.

Snowfall

February through November are months without snowfall in Atlantic Beach.

Ocean temperature

In September, the average ocean temperature in Atlantic Beach is 82.4°F (28°C).
Note: 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.

Daylight

In Atlantic Beach, Florida, the average length of the day in September is 12.3h.

Sunshine

The average sunshine in Atlantic Beach is 8.7h.

UV index

Months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the ordinary 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. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Atlantic Beach?

The average high-temperature, in September, is 85.8°F (29.9°C), while the average low-temperature is 75.4°F (24.1°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 96.8°F (36°C).

What is the average humidity in September in Atlantic Beach?

In September, the average relative humidity is 75%.

How many days does it rain in September in Atlantic Beach?

In Atlantic Beach, Florida, in September, it is raining for 20 days, with typically 4.09" (104mm) of accumulated precipitation.

When it does not snow in Atlantic Beach?

February through November are months without snowfall in Atlantic Beach, Florida.

How warm is the water in September in Atlantic Beach?

In September, the average ocean temperature in Atlantic Beach, Florida, is 82.4°F (28°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Atlantic Beach have in September?

In September, the average length of the day in Atlantic Beach is 12.3h.

How long on average sun shines in September in Atlantic Beach?

In September, the average sunshine in Atlantic Beach is 8.7h.

When is the highest UV index in Atlantic Beach?

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

What is the UV index reading in September in Atlantic Beach?

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 the UV radiation.

Average temperature in September
Atlantic Beach, FL

Average temperature in September - Atlantic Beach, FL
  • Average high temperature in September: 85.8°F

The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (63.3°F).

  • Average low temperature in September: 75.4°F

Months with the highest average low temperature are July and August (77.5°F).
The coldest month (with the lowest average low temperature) is January (50.4°F).

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Average pressure in September
Atlantic Beach, FL

Average pressure in September - Atlantic Beach, FL
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are August and September (29.98").

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Average wind speed in September
Atlantic Beach, FL

Average wind speed in September - Atlantic Beach, FL
  • Average wind speed in September: 7.2mph

The windiest months (with the highest average wind speed) are January, March, April, October and November (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in September
Atlantic Beach, FL

Average humidity in September - Atlantic Beach, FL
  • Average humidity in September: 75%

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

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Average rainfall in September
Atlantic Beach, FL

Average rainfall in September - Atlantic Beach, FL
  • Average rainfall in September: 4.09"

The wettest month (with the highest rainfall) is August (4.8").
The driest month (with the least rainfall) is January (1.3").

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Average rainfall days in September
Atlantic Beach, FL

Average rainfall days in September - Atlantic Beach, FL
  • Average rainfall days in September: 20 days

The month with the highest number of rainy days is August (25.3 days).
The month with the least rainy days is February (9.8 days).

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Average snowfall days in September
Atlantic Beach, FL

Average snowfall days in September - Atlantic Beach, FL
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and December (0.1 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in September
Atlantic Beach, FL

Average sea temperature in September - Atlantic Beach, FL
  • Average sea temperature in September: 82°F

The best month for swimming (with the highest average sea temperature) is August (84°F).
The coldest months (with the lowest average sea temperature) are January, February and March (70°F).

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Average daylight in September /
Average sunshine in September
Atlantic Beach, FL

Average daylight in September / Average sunshine in September - Atlantic Beach, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 11h).
Months with the least sunshine are January and December (Average sunshine: 5.9).

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Average sunshine days in September
Atlantic Beach, FL

Average sunshine days in September - Atlantic Beach, FL
  • Average sunshine days in September: 7.2 days

The month with the most sunshine days is January (18.8 days).
The month with the least sunshine days is August (4.2 days).

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Average UV index in September
Atlantic Beach, FL

Average UV index in September - Atlantic Beach, 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 December (UV index 4).

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Average cloud cover in September
Atlantic Beach, FL

Average cloud cover in September - Atlantic Beach, FL
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 38).
The month with the least cloud cover is May (Cloud cover 26).

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Average visibility in September
Atlantic Beach, FL

Average visibility in September - Atlantic Beach, 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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