Weather In New Orleans In September 2025. Get the monthly weather forecast for new orleans, la, including daily high/low, historical averages, to help you plan ahead. Weather.com brings you the most accurate monthly weather forecast for new orleans, la with average/record and high/low temperatures, precipitation and more.

Not only does the month bring cooler weather, but it also brings restaurant. Expect 30°c daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in new orleans in september.