Climate averages 1991–2020
New Orleans weather
in September.
A hot, wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in New Orleans: daytime highs average 28.9°C and nights cool to about 23.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 123 mm of rain on roughly 13 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.
The nearest other city in this atlas is Metairie (8 km away). In September its highs average 29.1°C, about as warm as New Orleans, with 118 mm of rain.
Among the 498 cities listed in the United States, New Orleans ranks joint 175th of 498 for the warmest September highs and joint 454th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; New Orleans is 2.0°C warmer than that mean.
From September to October, average highs fall by 3.8°C to 25.2°C, and monthly rainfall falls from 123 mm to 88 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
New Orleans climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 15.9°C9.1°C | 9.1°C | 113 | 9.7 | 10.510 h |
| February | 17.8°C10.7°C | 10.7°C | 108 | 8.9 | 11.111 h |
| March | 20.6°C13.6°C | 13.6°C | 114 | 9.4 | 12.012 h |
| April | 23.9°C17.1°C | 17.1°C | 99 | 8.4 | 12.913 h |
| May | 27.7°C21.1°C | 21.1°C | 91 | 9.2 | 13.614 h |
| June | 30.1°C24.3°C | 24.3°C | 131 | 15.0 | 14.014 h |
| July | 30.8°C25.4°C | 25.4°C | 143 | 17.9 | 13.914 h |
| August | 30.7°C25.4°C | 25.4°C | 159 | 17.3 | 13.213 h |
| September, selected | 28.9°C23.5°C | 23.5°C | 123 | 12.8 | 12.412 h |
| October | 25.2°C18.9°C | 18.9°C | 88 | 8.0 | 11.511 h |
| November | 20.4°C13.6°C | 13.6°C | 83 | 7.3 | 10.711 h |
| December | 17.1°C10.5°C | 10.5°C | 96 | 9.2 | 10.310 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Metairie in SeptemberUnited States · 8 kmHigh 29.1°C · Low 23.5°C · 118 mm rain
- Gulfport in SeptemberUnited States · 105 kmHigh 28.8°C · Low 22.9°C · 144 mm rain
- Baton Rouge in SeptemberUnited States · 120 kmHigh 30.1°C · Low 21.8°C · 100 mm rain
- Lafayette (Louisiana), United States in SeptemberUnited States · 189 kmHigh 30.3°C · Low 22.0°C · 96 mm rain
- Mobile in SeptemberUnited States · 212 kmHigh 29.4°C · Low 22.2°C · 117 mm rain
- Jackson in SeptemberUnited States · 261 kmHigh 30.4°C · Low 19.9°C · 83 mm rain
- Lake Charles in SeptemberUnited States · 302 kmHigh 30.3°C · Low 21.9°C · 121 mm rain
- Beaumont in SeptemberUnited States · 388 kmHigh 30.2°C · Low 22.0°C · 136 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for New Orleans) is explained once on the New Orleans year overview and on the Sources, method and limits page.