Want to know about the water temperature in Cancun in December? The Caribbean Sea is warm all year long, so you can comfortably swim, snorkel and go scuba diving in Cancun in December. Note: Water temperatures between 77°F (25°C) and 84°F (29°C) are regarded as warm.
Which part of Mexico is best in December?
Our tips for the best places to visit in Mexico in December include Mexico City, San Miguel de Allende, resorts on the Yucatan Peninsula, and Los Cabos in Baja California.