WEATHER · CLIMATE NORMALS · 1991–2020
New Orleans Climate — Averages by Month
What the weather in New Orleans, USaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 12.4 °C · coldest | 117.2 mm |
| February | 14.2 °C | 111.1 mm |
| March | 17.2 °C | 118.3 mm |
| April | 20.6 °C | 103.0 mm |
| May | 24.4 °C | 96.8 mm |
| June | 27.2 °C | 137.9 mm |
| July | 27.9 °C · warmest | 150.2 mm |
| August | 27.9 °C | 166.4 mm · wettest |
| September | 26.2 °C | 129.5 mm |
| October | 21.9 °C | 91.0 mm |
| November | 16.8 °C | 85.2 mm |
| December | 13.7 °C | 100.8 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest New Orleans — centred at 30.00°N, 90.00°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.