September weather forecast and climate
Slidell, LA

Weather in September

September, the first month of the autumn, in Slidell, is still a hot month, with average temperature fluctuating between 73.4°F (23°C) and 87.3°F (30.7°C).

Temperature

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

Heat index

The average heat index in September is appraised at a sweltering 100.9°F (38.3°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 the 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', 'feels like', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, clothing, pregnancy, and metabolic differences affect individual temperature impact. 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 particularly important for children. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. 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, there are 173.3 rainfall days, and 30.79" (782mm) of precipitation is accumulated.

Snowfall

In Slidell snow does not fall in February through December.

Daylight

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

Sunshine

The average sunshine in September is 10.3h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Slidell, in September, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 73.4°F (23°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines both air temperature and relative humidity, in September is appraised at 100.9°F (38.3°C).

What is the average humidity in September in Slidell?

In September, the average relative humidity in Slidell, Louisiana, is 75%.

How many days does it rain in September in Slidell?

In Slidell, during September, the rain falls for 18.4 days and regularly aggregates up to 2.4" (61mm) of precipitation.

When it does not snow in Slidell?

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

How many hours of daylight does Slidell have in September?

The average length of the day in September in Slidell, Louisiana, is 12.3h.

How many hours of sunshine does Slidell have in September?

The average sunshine in September in Slidell, Louisiana, is 10.3h.

What is the UV index intensity in September in Slidell?

In September, the average daily maximum UV index in Slidell is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.

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"

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

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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").
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).
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: 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: 10.3h

The month with the most sunshine is June (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 5.1h).

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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

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

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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