What is the Weather in New Orleans in September?

September starts a cooling trend that brings drier and more comfortable weather as the month progresses, making it a great time to visit.

If you are coming at the start or end of the month, you may want to read our posts on New Orleans weather in August and October.


What is the weather like in September

Early September can be hot and humid in New Orleans, however, as the month progresses somewhat drier and more comfortable weather can often be found here. The chance of experiencing a muggy day is over 90% early in the month but decreases to about 50% by the end of the month.

Early in September daytime high temperatures tend to be near 90 F (about 32 C) with a couple of the warmer days reaching into the mid-90s F (about 35 C). Near the end of this month, however, high temperatures will more likely be in the mid 80s F (28 C-29 C). About 10 days this month will see high temperatures at or above 90F (32 C) but this about half the number of 90F+ days experienced during August. The hottest temperature ever recorded in New Orleans during September was 101 F (38.3C).

Late night and early morning low temperatures tend to be in the mid to upper 70s F (about 25 C) early in the month but will more likely be in the lower 70s F (21 C-22 C) near the end of the month. A few of the cooler mornings during the latter half of the month could even dip down as low as the low to mid 60s F (16 C-17 C). The record low temperature in New Orleans during September is 42F (5.6C).

During the month of September, New Orleans does see a decrease in cloudiness with about 20-21 days recording either clear or at least partly sunny conditions. The risk for a rainy day also decreases throughout the month with about 9 days, overall, recording at least 0.01 inches (0.25 mm) of rain.

Daylight averages about 12.6 hours early in the month decreasing to just under 12 hours near the end of the month which is still amble time to explore this great city. Wind tends to be light to moderate, averaging between 4b mph and 14 mph.

Hurricane Risk

September is the peak of the hurricane season and there is about a 1 in 3 chance for tropical storm wind gusts and a 1 in 10 chance for hurricane force wind gusts in New Orleans sometime during the season (June through November).

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What to wear in New Orleans in September

It is best to pack clothing that is light and breathable as September continues to be very warm in New Orleans.

Lightweight layers will help you stay dry and seem to be a best for those warm and humid days. Later in the month, a few mornings can be on the cool side so packing a light sweater or two could come in handy.

Bring your umbrella and a couple pairs of good walking shoes!

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What to do in New Orleans in September

Some events this month worth a look are Restaurant Week. And not to far out of town is the Alligator Festival.

For a comprehensive post, read our Things To Do in New Orleans in September post.

You can really see this city by joining us for one of our professionally guided “pay what you want” New Orleans walking tours or perhaps you might try one of our New Orleans Bike Tours

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About the author

Fred is a marine meteorologist and sailed briefly with American Export Lines in the Far East trade. He has extensive experience in weather analysis, weather forecasting, and forensic weather event reconstructions. Fred founded Ocean Weather Services and currently provides forensic marine weather reports to the maritime industry.

Manager | New Orleans

Sarah first moved to New Orleans in 2001 to work for the American Red Cross of Southeast Louisiana. While working in the communities of New Orleans she fell in love with the unique culture of the Big Easy; it's food, music, architecture, wildlife, and most of all history.

Sarah began her career with FTBF, first as a guide, then as an owner/operator. She believes every day is a good day if she gets to impart her love of her beloved New Orleans with Free Tours By Foot guests. She especially likes to convert new Who Dat Saints Fans!