The Gulf of Mexico provides New Orleans with plenty of moisture - the city receives about 150cm (60in) of rainfall annually and no season is immune from it. In March, April and May the weather is quite variable, with plenty of rain; but spring has sunny, mild days that are perfect for the festivals. Summer is hot, sticky and steamy, often with thundershowers. September and October days are the most likely to offer clear, temperate weather. Winter temperatures average a comfortable 12°C (54°F), yet occasional drops in temperature, combined with the damp atmosphere, can chill you to the bone. Snow is rare but December's short days, fog and rain conspire to allow only a few hours of daily sunshine.
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | 8 - 17 | 117 | 5 | |
| Feb | 10 - 18 | 107 | 6 | |
| Mar | 13 - 22 | 119 | 7 | |
| Apr | 16 - 25 | 122 | 8 | |
| May | 20 - 28 | 114 | 9 | |
| Jun | 23 - 31 | 140 | 9 | |
| Jul | 24 - 32 | 168 | 8 | |
| Aug | 24 - 32 | 147 | 8 | |
| Sep | 23 - 30 | 122 | 8 | |
| Oct | 18 - 26 | 89 | 8 | |
| Nov | 13 - 21 | 97 | 6 | |
| Dec | 9 - 18 | 117 | 5 |