Semi-tropical weather, where the sun shines 253 days of the year on average, helps Cancún maintain a healthy holiday reputation. Rainfall is rare, though violent storms called nortes can roll in on any afternoon, their black clouds, high winds and torrents of rain followed within an hour by bright sun and blue sky. Averages don't drop much below 20°C (68°F), summer temperatures push but rarely exceed 35°C (95°F) and the humidity level stays just high enough for the promise of a swim to be tempting all year round.
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | 19 - 27 | 89 | ||
| Feb | 20 - 27 | 56 | ||
| Mar | 21 - 28 | 41 | ||
| Apr | 22 - 29 | 41 | ||
| May | 25 - 31 | 117 | ||
| Jun | 25 - 31 | 178 | ||
| Jul | 25 - 32 | 109 | ||
| Aug | 25 - 32 | 150 | ||
| Sep | 24 - 31 | 229 | ||
| Oct | 23 - 30 | 218 | ||
| Nov | 22 - 28 | 97 | ||
| Dec | 20 - 27 | 109 |