September weather forecast
Slidell, LA

Weather in September

The first month of the autumn, September, is still a tropical month in Slidell, Louisiana, with temperature in the range of an average low of 73.4°F (23°C) and an average high of 87.3°F (30.7°C).

Temperature

In Slidell, the average high-temperature in September is almost the same as in August - a still tropical 87.3°F (30.7°C). In Slidell, the average low-temperature is 73.4°F (23°C).

Heat index

The average heat index in September is appraised at a sweltering 100.4°F (38°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, wind), and activity. 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. 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 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

In September, the average relative humidity is 75%.

Rainfall

In Slidell, in September, it is raining for 18.4 days, with typically 2.4" (61mm) of accumulated precipitation. Throughout the year, in Slidell, Louisiana, there are 173.3 rainfall days, and 30.79" (782mm) of precipitation is accumulated.

Snowfall

In Slidell, Louisiana, snow does not fall in February through December.

Daylight

In September, the average length of the day in Slidell is 12h and 20min.
On the first day of September in Slidell, sunrise is at 6:36 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:45 pm CDT.

Sunshine

In Slidell, the average sunshine in September is 10.3h.

UV index

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Slidell?

In September, in Slidell, Louisiana, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 73.4°F (23°C). in September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 100.4°F (38°C).

What is the average humidity in September in Slidell?

In September, the average relative humidity is 75%.

How much does it rain in Slidell in September?

In September, in Slidell, Louisiana, the rain falls for 18.4 days. Throughout September, 2.4" (61mm) of precipitation is accumulated.

When it does not snow in Slidell?

In Slidell, snow does not fall in February through December.

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

In September, the average day length in Slidell is 12h and 20min.

When is the sunrise / sunset in September in Slidell?

On the first day of September in Slidell, sunrise is at 6:36 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:45 pm CDT.

How long on average sun shines in September in Slidell?

In September, the average sunshine duration is 10.3h.

What is the UV index reading in September in Slidell?

In Slidell, Louisiana, the average daily maximum UV index in September is 6. A UV Index estimate 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
Slidell, LA

Average temperature in September - Slidell, LA
  • Average high temperature in September: 87.3°F

The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (59.4°F).

  • Average low temperature in September: 73.4°F

The month with the highest average low temperature is August (77.4°F).
The coldest month (with the lowest average low temperature) is January (45.1°F).

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Average pressure in September
Slidell, LA

Average pressure in September - Slidell, LA
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).

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Average wind speed in September
Slidell, LA

Average wind speed in September - Slidell, LA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).

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Average humidity in September
Slidell, LA

Average humidity in September - Slidell, LA
  • Average humidity in September: 75%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in September
Slidell, LA

Average rainfall in September - Slidell, LA
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is August (4.92").
The driest month (with the least rainfall) is November (1.5").

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Average rainfall days in September
Slidell, LA

Average rainfall days in September - Slidell, LA
  • Average rainfall days in September: 18.4 days

The month with the highest number of rainy days is August (23.5 days).
The month with the least rainy days is November (8 days).

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Average snowfall in September
Slidell, LA

Average snowfall in September - Slidell, LA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.2").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Slidell, LA

Average snowfall days in September - Slidell, LA
  • Average snowfall days in September: 0.1 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, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Slidell, LA

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

The month with the longest days is June (Average daylight: 14h and 4min).
The month with the shortest days is December (Average daylight: 10h and 14min).

  • Average sunshine in September: 10h and 18min

The month with the most sunshine is June (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in September
Slidell, LA

Average sunshine days in September - Slidell, LA
  • Average sunshine days in September: 8.1 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (5.1 days).

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Average UV index in September
Slidell, LA

Average UV index in September - Slidell, 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
Slidell, LA

Average cloud cover in September - Slidell, LA
  • Average cloud cover in September: 25

The month with the most cloud cover is December (Cloud cover 45).
The month with the least cloud cover is October (Cloud cover 24).

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Average visibility in September
Slidell, LA

Average visibility in September - Slidell, 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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