New Orleans, LA weather in September
Expect hot, oppressively humid weather with some rain in New Orleans in September, with highs near 90°F and lows near 74°F. Rain falls on about 9 days.
- Normal high
- 90°F
- Normal low
- 74°F
- Wet days
- 9
- 4.6 in total
- Muggy days
- 26
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 93°F | 87°F |
| Normal low | 76°F | 70°F |
| Chance of a wet day | 35% | 26% |
| Sunrise / sunset | 6:37 am / 7:23 pm | 6:53 am / 6:47 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am78°Fdew point 71°F
- 9 am82°Fdew point 71°F
- Noon85°Fdew point 71°F
- 3 pm86°Fdew point 70°F
- 6 pm83°Fdew point 70°F
- 9 pm80°Fdew point 71°F
NOAA hourly normals (local standard time) from New Orleans Lakefront Airport (7 mi away); average wind 9 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more17 of 30
- Muggy daysdaily mean dew point 65°F or more26 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.6 in; a dry September brings about 2.7 in and a wet one about 6.4 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 94°F
- Coolest September1992: average high 86°F
- Wettest September1998: 11.3 in
- Driest September1997: 0.3 in
- Highest reading101°F (September 4, 2000)
- Lowest reading53°F (September 18, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 94°F | 90°F | 83°F |
| Normal low | 77°F | 74°F | 65°F |
| Wet days | 12 | 9 | 7 |
| Comfortable days | 0 | 1 | 7 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -4°F from August and -7°F into October.
How New Orleans ranks in September
- Normal high46th warmest of 378 cities; 1st of 5 in Louisiana
- Wet days244th driest of 378
- Comfortable days293rd most of 342
What to pack for New Orleans in September
- Light, breathable clothing – highs near 90°F and about 26 muggy days
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 0 heating degree days and 506 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is New Orleans in September?
The normal high is 90°F and the normal low is 74°F. From 1991 to 2020 the hottest September reading was 101°F (most recently on September 4, 2000).
Does it rain a lot in New Orleans in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 4.6 in. The wettest September in 1991-2020 was in 1998 (11.3 in); the driest was in 1997 (0.3 in).
Is September a good time to visit New Orleans?
September ranks 9th of 12 months on our comfort score for New Orleans (38 out of 100). It has about 1 comfortable day and about 17 days at 90°F or hotter. The best months are March, April and November.
Where the numbers come from
- Temperature and frost dates: New Orleans Audubon (USW00012930), 4.2 mi SW of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall, snow depth and humidity and wind by hour: New Orleans Lakefront Airport (USW00053917), 7.1 mi NNE of the city center, 9 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Louis Armstrong New Orleans Intl Airport (722310-12916), 13 mi WNW of the city center, -3 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).