September weather forecast
Holly Beach, LA

Weather in September

The first month of the autumn, September, is still a tropical month in Holly Beach, Louisiana, with an average temperature varying between 72.3°F (22.4°C) and 87.6°F (30.9°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still hot 87.6°F (30.9°C). In September, the average low-temperature is 72.3°F (22.4°C).

Heat index

The average heat index in September is evaluated at a torrid 102.6°F (39.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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', 'felt air temperature', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, differences in body mass, height, and shape, metabolic differences). 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In Holly Beach, Louisiana, the average relative humidity in September is 76%.

Rainfall

In Holly Beach, in September, during 15.7 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. In Holly Beach, Louisiana, during the entire year, the rain falls for 168 days and collects up to 34.96" (888mm) of precipitation.

Snowfall

In Holly Beach, snow does not fall in February through November.

Daylight

In September, the average length of the day in Holly Beach is 12h and 20min.
On the first day of the month, sunrise is at 6:51 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:06 am and sunset at 7:00 pm CDT.

Sunshine

In Holly Beach, the average sunshine in September is 9.6h.

UV index

In September, the average daily maximum UV index in Holly Beach is 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
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. 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 Holly Beach?

The average high-temperature, in September, is 87.6°F (30.9°C), while the average low-temperature is 72.3°F (22.4°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 102.6°F (39.2°C).

What is the average humidity in September in Holly Beach?

The average relative humidity in September is 76%.

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

In Holly Beach, in September, it is raining for 15.7 days, with typically 3.11" (79mm) of accumulated precipitation.

When it does not snow in Holly Beach?

In Holly Beach, Louisiana, snow does not fall in February through November.

What is the average length of the day in September in Holly Beach?

In September, the average day length in Holly Beach, Louisiana, is 12h and 20min.

When is the sunrise / sunset in September in Holly Beach?

In September, on the first day of the month, sunrise is at 6:51 am and sunset at 7:36 pm. On the last day of the month, in Holly Beach, sunrise is at 7:06 am and sunset at 7:00 pm CDT.

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

In September, the average sunshine duration is 9.6h.

How high is the UV index in September in Holly Beach?

In Holly Beach, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Holly Beach, LA

Average temperature in September - Holly Beach, LA
  • Average high temperature in September: 87.6°F

The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is January (59.5°F).

  • Average low temperature in September: 72.3°F

The month with the highest average low temperature is July (77.2°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in September
Holly Beach, LA

Average pressure in September - Holly Beach, LA
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).

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Average wind speed in September
Holly Beach, LA

Average wind speed in September - Holly Beach, LA
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in September
Holly Beach, LA

Average humidity in September - Holly Beach, LA
  • Average humidity in September: 76%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Holly Beach, LA

Average rainfall in September - Holly Beach, LA
  • Average rainfall in September: 3.11"

The wettest month (with the highest rainfall) is August (5").
The driest month (with the least rainfall) is April (2.09").

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Average rainfall days in September
Holly Beach, LA

Average rainfall days in September - Holly Beach, LA
  • Average rainfall days in September: 15.7 days

The month with the highest number of rainy days is August (19.3 days).
The month with the least rainy days is November (9.7 days).

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Average snowfall in September
Holly Beach, LA

Average snowfall in September - Holly Beach, LA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Holly Beach, LA

Average snowfall days in September - Holly Beach, LA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The 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 daylight in September /
Average sunshine in September
Holly Beach, LA

Average daylight in September / Average sunshine in September - Holly Beach, LA
  • Average daylight in September: 12h and 20min

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

  • Average sunshine in September: 9h and 36min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

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Average sunshine days in September
Holly Beach, LA

Average sunshine days in September - Holly Beach, LA
  • Average sunshine days in September: 13.4 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is August (10.3 days).

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Average UV index in September
Holly Beach, LA

Average UV index in September - Holly Beach, LA
  • Average UV index in September: 6

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Holly Beach, LA

Average cloud cover in September - Holly Beach, LA
  • Average cloud cover in September: 30

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 26).

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Average visibility in September
Holly Beach, LA

Average visibility in September - Holly Beach, LA
  • 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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