New Orleans, Louisiana weather in September

Averages from 2021–2025 (150 days of record).

Average high: 86°F
Average low: 75°F
Rainy days: ~14 per month
Total precipitation: 6.5 in
Warmest recorded: 93°F
Coldest recorded: 62°F

Expect September days in New Orleans, Louisiana to top out around 86°F and cool to about 75°F overnight, with roughly 14 days of measurable rain across the month. In recent years September has ranged from 62°F to 93°F.

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Current New Orleans, Louisiana forecast → · Historical data by Open-Meteo (ERA5).