New Orleans weather in September: New Orleans, Louisiana: normal highs, lows, rain and records for September
New Orleans in September has a normal high of 88°F and a normal low of 74°F, a daily mean of 81°F, falling from 90°F on the 1st to 85°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 5.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 23°C, 130 mm of precipitation in September.
- NOAA stationNew Orleans Airport
- Station IDUSW00012916
- Location29.99°N 90.25°W
- Elevation4 ft (1 m)
- From the center19 miles
- Population362,701
- Jan 63° 46°
- Feb 66° 50°
- Mar 72° 55°
- Apr 79° 62°
- May 85° 69°
- Jun 90° 75°
- Jul 91° 77°
- Aug 91° 77°
- Sep 88° 74°
- Oct 81° 64°
- Nov 71° 54°
- Dec 65° 48°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is New Orleans in September?
The normal high is 88°F and the normal low 74°F, for a daily mean of 80.8°F. September is 3.2°F cooler than August and 8.3°F warmer than October. September is the 4th warmest month of the year in New Orleans and the 7th wettest. Across the month the normal high falls 5°F, from 90°F on September 1 to 85°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 79°F and 83°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 76°F | 39% | 28% |
| September 8 | 89°F | 75°F | 36% | 25% |
| September 15 | 88°F | 74°F | 33% | 23% |
| September 22 | 87°F | 72°F | 30% | 21% |
| September 30 | 85°F | 70°F | 26% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 90°F | 76°F | 39% | 28% | 12 h 50 min |
| September 2 | 90°F | 76°F | 39% | 27% | 12 h 50 min |
| September 3 | 90°F | 76°F | 39% | 27% | 12 h 40 min |
| September 4 | 90°F | 76°F | 38% | 27% | 12 h 40 min |
| September 5 | 90°F | 75°F | 38% | 26% | 12 h 40 min |
| September 6 | 90°F | 75°F | 37% | 26% | 12 h 40 min |
| September 7 | 90°F | 75°F | 37% | 25% | 12 h 40 min |
| September 8 | 89°F | 75°F | 36% | 25% | 12 h 40 min |
| September 9 | 89°F | 75°F | 36% | 25% | 12 h 30 min |
| September 10 | 89°F | 75°F | 35% | 25% | 12 h 30 min |
| September 11 | 89°F | 75°F | 35% | 24% | 12 h 30 min |
| September 12 | 89°F | 74°F | 34% | 24% | 12 h 30 min |
| September 13 | 89°F | 74°F | 34% | 24% | 12 h 30 min |
| September 14 | 89°F | 74°F | 33% | 23% | 12 h 20 min |
| September 15 | 88°F | 74°F | 33% | 23% | 12 h 20 min |
| September 16 | 88°F | 74°F | 33% | 23% | 12 h 20 min |
| September 17 | 88°F | 74°F | 32% | 22% | 12 h 20 min |
| September 18 | 88°F | 73°F | 32% | 22% | 12 h 20 min |
| September 19 | 88°F | 73°F | 31% | 22% | 12 h 20 min |
| September 20 | 88°F | 73°F | 31% | 21% | 12 h 10 min |
| September 21 | 87°F | 73°F | 30% | 21% | 12 h 10 min |
| September 22 | 87°F | 72°F | 30% | 21% | 12 h 10 min |
| September 23 | 87°F | 72°F | 29% | 20% | 12 h 10 min |
| September 24 | 87°F | 72°F | 29% | 20% | 12 h 10 min |
| September 25 | 87°F | 72°F | 28% | 20% | 12 h 10 min |
| September 26 | 86°F | 71°F | 28% | 19% | 12 h |
| September 27 | 86°F | 71°F | 27% | 19% | 12 h |
| September 28 | 86°F | 71°F | 27% | 18% | 12 h |
| September 29 | 86°F | 71°F | 26% | 18% | 12 h |
| September 30 | 85°F | 70°F | 26% | 18% | 12 h |
- Normal high
- 88°FSeptember average
- Normal low
- 74°FSeptember average
- Precipitation
- 5.11 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 13
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 29
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012916; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in New Orleans in September?
On a given September day the chance of 0.01 inch or more is 33% on average, highest around September 1 (39%). In all, 5.11 in falls on 10 days of a normal September, 2 of them with an inch or more.
In a normal September in New Orleans, 13 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012916.
How humid and windy is New Orleans in September?
At 3 p.m. the normal temperature is 83°F with 54% relative humidity and a dew point of 65°F; at 6 a.m. it is 71°F with 84% humidity. The wind averages 8.0 mph, most often from the northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 71°F | 66°F | 84% | 6.4 mph | 48% |
| 9 a.m. | 78°F | 67°F | 69% | 9.8 mph | 44% |
| noon | 82°F | 66°F | 58% | 10.4 mph | 36% |
| 3 p.m. | 83°F | 65°F | 54% | 10.0 mph | 41% |
| 6 p.m. | 78°F | 65°F | 64% | 7.8 mph | 38% |
| 9 p.m. | 75°F | 66°F | 74% | 7.2 mph | 59% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012916. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in New Orleans?
The warmest September temperature on New Orleans's official record (since 1946) is 101°F, on September 10, 1980; the coldest is 42°F, on September 30, 1967. The wettest September brought 18.98 in (1998).
The September mean against the 1991-2020 normal of 80.8°F: 2021 79.4°F (−1.4), 2022 80.6°F (−0.2), 2023 83.6°F (+2.8), 2024 80.8°F (at normal), 2025 82.7°F (+1.9), 2026 82.7°F (+1.9). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.4°F | −1.4°F | 9.38 in |
| 2022 | 80.6°F | −0.2°F | 2.46 in |
| 2023 | 83.6°F | +2.8°F | 4.12 in |
| 2024 | 80.8°F | at normal | 17.37 in |
| 2025 | 82.7°F | +1.9°F | 0.64 in |
| 2026 | 82.7°F | +1.9°F | 7.22 in |
Source: records: ACIS, NWS threaded record MSYthr; recent months: ACIS, station USW00012916. Records and recent months use complete months only.
How does September in New Orleans compare across Louisiana?
Across the 65 places PlainClimate covers in Louisiana, September normal highs run from 85°F in Boyce to 90°F in Natchitoches; New Orleans's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- New Orleans in August91°F by day, 77°F at night
- New Orleans in October81°F by day, 64°F at night
- New Orleans through the yearEvery month, frost dates, records and recent years
- Louisiana in SeptemberThe statewide normal and the warmest and coolest places
- Natchitoches: Louisiana's warmest Septembernormal high 90°F