September weather forecast
Port Allen, LA

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Weather in September

September, the first month of the autumn in Port Allen, is also a hot month, with an average temperature varying between 88°F (31.1°C) and 70°F (21.1°C).

Temperature

Port Allen signifies an average high-temperature of a still hot 88°F (31.1°C) in September, closely mirroring the 91.9°F (33.3°C) of August. Throughout September, the average low-temperature dips to an agreeable 70°F (21.1°C).

Heat index

The heat index value for September is computed to be a blisteringly hot 105.8°F (41°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in September is 78%.

Rainfall

In Port Allen, in September, it is raining for 17.6 days, with typically 2.95" (75mm) of accumulated precipitation. Throughout the year, there are 177.1 rainfall days, and 36.1" (917mm) of precipitation is accumulated.

Snowfall

February through November are months without snowfall.

Daylight

In September, the average length of the day is 12h and 20min.
On the first day of the month, sunrise is at 6:41 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:50 pm CDT.

Sunshine

In Port Allen, the average sunshine in September is 9.5h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.

Frequently asked questions

How hot is September?

The high-temperature, in September, in Port Allen, records 88°F (31.1°C), while the low-temperature is 70°F (21.1°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is computed to be 105.8°F (41°C).

What is the average humidity in September?

In Port Allen, the average relative humidity in September is 78%.

How many days does it rain in September?

In Port Allen, in September, it is raining for 17.6 days, with typically 2.95" (75mm) of accumulated precipitation.

When it does not snow in Port Allen?

In Port Allen, Louisiana, snow does not fall in February through November.

How many hours of daylight does Port Allen have in September?

The average day length in September is 12h and 20min.

What time are sunrise and sunset in September?

On the first day of September in Port Allen, sunrise is at 6:41 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:50 pm CDT.

How long on average sun shines in September?

In Port Allen, the average sunshine duration in September is 9.5h.

What is the UV index intensity in September?

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

Average temperature in September
Port Allen, LA

Average temperature in September - Port Allen, LA
  • Average high temperature in September: 88°F

The warmest months (with the highest average high temperature) are July and August (91.9°F).
The month with the lowest average high temperature is January (58.6°F).

  • Average low temperature in September: 70°F

The month with the highest average low temperature is August (73.9°F).
The coldest month (with the lowest average low temperature) is January (42.4°F).

Average pressure in September
Port Allen, LA

Average pressure in September - Port Allen, LA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.96"Hg).

Average wind speed in September
Port Allen, LA

Average wind speed in September - Port Allen, LA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest month (with the lowest average wind speed) is July (4.4mph).

Average humidity in September
Port Allen, LA

Average humidity in September - Port Allen, LA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Port Allen, LA

Average rainfall in September - Port Allen, LA
  • Average rainfall in September: 2.95"

The wettest month (with the highest rainfall) is July (4.72").
The driest month (with the least rainfall) is November (1.77").

Average rainfall days in September
Port Allen, LA

Average rainfall days in September - Port Allen, LA
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is July (22.5 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in September
Port Allen, LA

Average snowfall in September - Port Allen, LA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.28").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Port Allen, LA

Average snowfall days in September - Port Allen, 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 March, April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
Port Allen, LA

Average daylight in September / Average sunshine in September - Port Allen, LA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

Average sunshine days in September
Port Allen, LA

Average sunshine days in September - Port Allen, LA
  • Average sunshine days in September: 10.4 days

The month with the most sunshine days is November (19.6 days).
The months with the least sunshine days are July and August (7.3 days).

Average UV index in September
Port Allen, LA

Average UV index in September - Port Allen, LA
  • Average UV index in September: 6

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

Average cloud cover in September
Port Allen, LA

Average cloud cover in September - Port Allen, LA
  • Average cloud cover in September: 34

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 29).

Average visibility in September
Port Allen, LA

Average visibility in September - Port Allen, LA
  • Average visibility in September: 5mi

The months with the highest visibility are October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and December (5mi).

Port Allen, Louisiana, USA

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