Cancún is warmest in May, averaging 31° by day and 26° at night. The wettest month is June with 249 mm, and the year brings about 1485 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 27° | 22° | 102 mm | 26° | 10.8 h | Beach weather |
| February | 28° | 23° | 53 mm | 26° | 11.3 h | Beach weather |
| March | 29° | 23° | 43 mm | 27° | 11.9 h | Beach weather |
| April | 31° | 25° | 33 mm | 27° | 12.5 h | Beach weather |
| May | 31° | 26° | 90 mm | 28° | 13.0 h | Beach weather |
| June | 30° | 26° | 249 mm | 28° | 13.3 h | Rainy season |
| July | 30° | 27° | 115 mm | 29° | 13.2 h | Mild |
| August | 31° | 27° | 143 mm | 29° | 12.7 h | Mild |
| September | 30° | 27° | 135 mm | 29° | 12.1 h | Mild |
| October | 30° | 26° | 236 mm | 29° | 11.5 h | Rainy season |
| November | 28° | 24° | 177 mm | 28° | 11.0 h | Mild |
| December | 27° | 23° | 109 mm | 27° | 10.7 h | Mild |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: January, February, March, April and May — highs around 29°, nights no colder than 22°, and at most 102 mm of rain in a month. The sea sits at 26–28° then.
Wet season: June and October — up to 249 mm in a single month.