New Orleans weather by month
New Orleans runs from about 11°C in January to 30°C in August, with September the wettest month at 428 mm.
warmest month
August
30°C
coolest month
January
11°C
wettest month
September
428 mm
worst air month
July
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 11°C | 234 mm | 232 h | 7 |
| February | 15°C | 90 mm | 227 h | 8 |
| March | 18°C | 195 mm | 252 h | 7 |
| April | 21°C | 87 mm | 299 h | 7 |
| May | 26°C | 189 mm | 338 h | 7 |
| June | 28°C | 120 mm | 359 h | 11 |
| July | 28°C | 222 mm | 329 h | 13 |
| August | 30°C | 134 mm | 336 h | 11 |
| September | 26°C | 428 mm | 270 h | 9 |
| October | 23°C | 49 mm | 319 h | 6 |
| November | 21°C | 123 mm | 245 h | 6 |
| December | 15°C | 116 mm | 247 h | 6 |
About 3,453 hours of sun a year. Roughly 186 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.