September weather forecast
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 also a hot month, with an average temperature varying between 86.5°F (30.3°C) and 76.3°F (24.6°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still tropical 86.5°F (30.3°C). The average low-temperature, is 76.3°F (24.6°C).

Heat index

In September, the average heat index is computed to be a torrid 98.6°F (37°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 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 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like differences in body mass, height, and shape, wind, clothing, and activity influence one's weather impression. 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by 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. 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 73%.

Rainfall

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

Snowfall

February through December are months without snowfall.

Daylight

The average length of the day in September in New Orleans is 12h and 20min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:47 pm CDT.

Sunshine

The average sunshine in September is 10.1h.

UV index

The months with the highest UV index in New Orleans are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from 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. Fair-skinned people may get burned in less than 20 minutes. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
[Resources]

FAQ

What is the temperature in September in New Orleans?

In New Orleans, Louisiana, in September, the average high-temperature is 86.5°F (30.3°C), and the average low-temperature is 76.3°F (24.6°C). in September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, is computed to be 98.6°F (37°C).

What is the average humidity in September 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, 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.

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

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

When are sunrise and sunset in September in New Orleans?

On the first day of September in New Orleans, Louisiana, sunrise is at 6:37 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:47 pm CDT.

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

In New Orleans, Louisiana, the average sunshine duration in September is 10.1h.

What are the months with the highest UV index in New Orleans?

The months with the highest UV index in New Orleans, Louisiana, are May through September, with an average maximum UV index of 7.

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

In New Orleans, Louisiana, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

[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%

The 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).
The 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: 12h and 20min

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

  • Average sunshine in September: 10h and 6min

The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

[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

The 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

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location