December weather forecast
Riviera Maya, Mexico

December marks the onset of winter in Riviera Maya with a further decrease in temperatures distinctively lower from the summer months. But rest assured, the climate maintains a comforting warmth, far from freezing winter conditions. Rainfall continues to decrease, dipping to 53mm (2.09") over 17.9 days, reinforcing the dry season phenomenon. The wind strengthens slightly during this time, while the humidity stays stable, upholding a pleasant balance in the air. These mild changes usher in a relaxed and comfortable environment, making December a delight for travelers.

Temperature

With the start of December, Riviera Maya measures an average high-temperature of a still warm 27.2°C (81°F), not significantly differing from November's 27.8°C (82°F). In Riviera Maya, the month of December records an average minimum temperature of 23.3°C (73.9°F), a slight dip from the daily highs.

Heat index

The average heat index in December is computed to be a tropical 30°C (86°F). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.
For clarity, heat index numbers account for light winds and areas under shade. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.

Humidity

The average relative humidity in December in Riviera Maya is 77%.

Rainfall

In Riviera Maya, in December, during 17.9 rainfall days, 53mm (2.09") of precipitation is typically accumulated. In Riviera Maya, Mexico, during the entire year, the rain falls for 227.8 days and collects up to 1036mm (40.79") of precipitation.

Daylight

The month with the shortest days is December, with an average of 10h and 54min of daylight.
On the first day of December, sunrise is at 7:08 am and sunset at 6:07 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 6:19 pm EST.

Sunshine

The average sunshine in December in Riviera Maya is 8.4h.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In December, a daily UV index of 6 turns into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.