September weather forecast and climate
Holly Beach, LA

Weather in September

The first month of the autumn, September, is also a hot month in Holly Beach, Louisiana, with 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 practically the same as in August - a still hot 87.6°F (30.9°C). In Holly Beach, the average low-temperature is 72.3°F (22.4°C).

Heat index

The average heat index in September is appraised at a sweltering 102.6°F (39.2°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, clothing, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. 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 particularly important for children. 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 normally cools itself by perspiration, as evaporated sweat carries heat away from the body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

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

Snowfall

February through November are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine is 9.6h.

UV index

In Holly Beach, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 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?

In September, in Holly Beach, Louisiana, the average high-temperature is 87.6°F (30.9°C), and the average low-temperature is 72.3°F (22.4°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is appraised at 102.6°F (39.2°C).

What is the average humidity in September in Holly Beach?

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?

February through November are months without snowfall in Holly Beach, Louisiana.

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

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

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

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

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

In Holly Beach, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.

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"

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

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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").
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).
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: 12.3h

The month with the longest days is June (Average daylight: 14h).
The month with the shortest days is December (Average daylight: 10.3h).

  • Average sunshine in September: 9.6h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is December (Average sunshine: 4.9h).

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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

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

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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