December weather forecast
Acapulco, Mexico

December, the first month of the winter in Acapulco, is also a moderately hot month, with temperature in the range of an average low of 22.9°C (73.2°F) and an average high of 29.3°C (84.7°F).
An excellent water temperature of 28.8°C (83.8°F) and only 3.2 rainfall days, with 4mm (0.16") of accumulated rainfall, makes December a prime for swimming and other water activities.

Temperature

December is the coldest month in Acapulco, with an average high-temperature of 29.3°C (84.7°F) and an average low-temperature of 22.9°C (73.2°F).

Heat index

The average heat index in December is estimated at a hot 33°C (91.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, differences in body mass, height, and shape, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In December, the average relative humidity is 68%.

Rainfall

In Acapulco, during 3.2 rainfall days, 4mm (0.16") of precipitation is typically accumulated. In Acapulco, Mexico, during the entire year, the rain falls for 144.3 days and collects up to 800mm (31.5") of precipitation.

Sea temperature

In Acapulco, the average seawater temperature in December is 28.8°C (83.8°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

December has the shortest days of the year in Acapulco, with an average of 11h and 8min of daylight.
On the first day of December, sunrise is at 6:52 am and sunset at 6:04 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:16 pm CST.

Sunshine

The average sunshine in December is 9.9h.

UV index

The months with the highest UV index in Acapulco are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Acapulco. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 7 in December transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.