September weather forecast and climate
New Orleans, LA

Commuter buses on the street in New Orleans, Louisiana
Commuter buses on the street in New Orleans, Louisiana

Weather in September

September, the first month of the autumn, in New Orleans, is still a tropical month, with average temperature varying between 76.3°F (24.6°C) and 86.5°F (30.3°C).

Temperature

In New Orleans, the average high-temperature in September is essentially the same as in August - a still hot 86.5°F (30.3°C). In New Orleans, Louisiana, in September, the average low-temperature is 76.3°F (24.6°C).

Heat index

The average heat index is estimated at a very hot 97.9°F (36.6°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. 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 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like metabolic differences, pregnancy, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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. 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 September, the average relative humidity in New Orleans is 73%.

Rainfall

In New Orleans, Louisiana, in September, it is raining for 11.7 days, with typically 0.47" (12mm) of accumulated precipitation. Throughout the year, there are 112.1 rainfall days, and 9.37" (238mm) of precipitation is accumulated.

Snowfall

In New Orleans snow does not fall in February through December.

Daylight

In New Orleans, the average length of the day is 12.3h.

Sunshine

In New Orleans, the average sunshine is 10.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in New Orleans. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 7 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.
[Resources]

FAQ

What is the temperature in September in New Orleans?

The average high-temperature, in September, in New Orleans, is 86.5°F (30.3°C), while the average low-temperature is 76.3°F (24.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, in September is estimated at 97.9°F (36.6°C).

What is the average humidity in September in New Orleans?

In New Orleans, the average relative humidity in September is 73%.

How many days does it rain in September in New Orleans?

In New Orleans, Louisiana, in September, it is raining for 11.7 days, with typically 0.47" (12mm) of accumulated precipitation.

When it does not snow in New Orleans?

February through December are months without snowfall in New Orleans, Louisiana.

What is the average length of the day in September in New Orleans?

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

How long on average sun shines in September in New Orleans?

The average sunshine in September in New Orleans is 10.1h.

What is the month with the highest UV index in New Orleans?

May through September, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in September in New Orleans?

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
New Orleans, LA

Average temperature in September - New Orleans, LA
  • Average high temperature in September: 86.5°F

The warmest months (with the highest average high temperature) are July and August (89.4°F).
The month with the lowest average high temperature is January (60.4°F).

  • Average low temperature in September: 76.3°F

The month with the highest average low temperature is August (79.5°F).
The coldest month (with the lowest average low temperature) is January (48.6°F).

[Resources]

Average pressure in September
New Orleans, LA

Average pressure in September - New Orleans, LA
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June, August and September (29.97").

[Resources]

Average wind speed in September
New Orleans, LA

Average wind speed in September - New Orleans, LA
  • Average wind speed in September: 7.1mph

The windiest months (with the highest average wind speed) are February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

[Resources]

Average humidity in September
New Orleans, LA

Average humidity in September - New Orleans, LA
  • Average humidity in September: 73%

Months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is October (71%).

[Resources]

Average rainfall in September
New Orleans, LA

Average rainfall in September - New Orleans, LA
  • Average rainfall in September: 0.47"

The wettest month (with the highest rainfall) is July (1.57").
The driest months (with the least rainfall) are March and April (0.43").

[Resources]

Average rainfall days in September
New Orleans, LA

Average rainfall days in September - New Orleans, LA
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is August (17.2 days).
The month with the least rainy days is November (4.7 days).

[Resources]

Average snowfall days in September
New Orleans, LA

Average snowfall days in September - New Orleans, LA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
New Orleans, LA

Average daylight in September / Average sunshine in September - New Orleans, 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: 10.1h

The month with the most sunshine is June (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 5.1h).

[Resources]

Average sunshine days in September
New Orleans, LA

Average sunshine days in September - New Orleans, LA
  • Average sunshine days in September: 12.5 days

The month with the most sunshine days is November (23.5 days).
The month with the least sunshine days is August (8.9 days).

[Resources]

Average UV index in September
New Orleans, LA

Average UV index in September - New Orleans, LA
  • Average UV index in September: 7

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

[Resources]

Average cloud cover in September
New Orleans, LA

Average cloud cover in September - New Orleans, LA
  • Average cloud cover in September: 25

The month with the most cloud cover is December (Cloud cover 44).
The month with the least cloud cover is October (Cloud cover 24).

[Resources]

Average visibility in September
New Orleans, LA

Average visibility in September - New Orleans, 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).

[Resources]