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

The first month of the autumn, September, is also a hot month in New Orleans, Louisiana, with average temperature ranging between max 86.5°F (30.3°C) and min 76.3°F (24.6°C).

Temperature

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

Heat index

The average heat index is evaluated at a torrid 97.9°F (36.6°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 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, pregnancy, differences in body mass, height, and shape, 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 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. 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 in New Orleans is 73%.

Rainfall

In New Orleans, during September, the rain falls for 11.7 days and regularly aggregates up to 0.47" (12mm) of precipitation. In New Orleans, during the entire year, the rain falls for 112.1 days and collects up to 9.37" (238mm) of precipitation.

Snowfall

February through December are months without snowfall in New Orleans.

Daylight

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

Sunshine

In September, the average sunshine in New Orleans 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 risk from unprotected 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 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. 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.
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FAQ

What is the temperature in September in New Orleans?

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). The average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, in September is evaluated 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 much does it rain in New Orleans in September?

In New Orleans, during September, the rain falls for 11.7 days and regularly aggregates up to 0.47" (12mm) of precipitation.

When it does not snow in New Orleans?

February through December are months without snowfall in New Orleans.

How many hours of daylight does New Orleans have in September?

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

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

In September, the average sunshine is 10.1h.

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

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

What is the UV index intensity in September in New Orleans?

In September, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
New Orleans, LA

Average temperature in September - New Orleans, LA
  • Average high temperature in September: 30.3°C

The warmest months (with the highest average high temperature) are July and August (31.9°C).
The month with the lowest average high temperature is January (15.8°C).

  • Average low temperature in September: 24.6°C

The month with the highest average low temperature is August (26.4°C).
The coldest month (with the lowest average low temperature) is January (9.2°C).

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Average pressure in September
New Orleans, LA

Average pressure in September - New Orleans, LA
  • Average pressure in September: 1015mbar

The month with the highest atmospheric pressure is January (1021.4mbar).
Months with the lowest atmospheric pressure are June and August (1014.9mbar).

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Average wind speed in September
New Orleans, LA

Average wind speed in September - New Orleans, LA
  • Average wind speed in September: 11.5km/h

The windiest month (with the highest average wind speed) is April (15.8km/h).
The calmest month (with the lowest average wind speed) is July (10.6km/h).

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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%).

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Average rainfall in September
New Orleans, LA

Average rainfall in September - New Orleans, LA
  • Average rainfall in September: 12mm

The wettest month (with the highest rainfall) is July (40mm).
The driest months (with the least rainfall) are March and April (11mm).

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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).

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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).

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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).

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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).

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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).

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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).

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Average visibility in September
New Orleans, LA

Average visibility in September - New Orleans, LA
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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