December weather forecast
Belém, Brazil

Capially of Pará, Belém, rounds off the year in December with a rise in the rainfall, measuring at 203mm (7.99"). As the city moves from November to December, there is a significant increase in the volume of rainfall. Despite the high precipitation levels, a steady rise in temperature complements the city's tropical character. December’s higher heat and rain lend a distinctive charm to Christmas festivities in the city. Rich in unique culinary delights, traditional clothing and colourful crafts, December offers a vibrant mix of cultural and weather experiences in Belém.

Temperature

Belém experiences a minor change to a still hot 31.9°C (89.4°F) in average high-temperature during December, closely reflecting November. Belém witnesses a consistent average low-temperature of 22°C (71.6°F) throughout December.

Heat index

December's mean heat index is estimated at a burning hot 47°C (116.6°F). Watchful: Heat cramps and heat exhaustion are predicted. Continued exertion could lead to heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', quantifies the warmth felt when relative humidity is considered. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In Belém, in December, during 17 rainfall days, 203mm (7.99") of precipitation is typically accumulated. Throughout the year, in Belém, there are 221 rainfall days, and 2922mm (115.04") of precipitation is accumulated.

Sea temperature

The months with the coldest seawater are September, October and December, with an average sea temperature of 28.2°C (82.8°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

With an average of 12h and 12min of daylight, December has the longest days of the year.
On the first day of December in Belém, sunrise is at 05:57 and sunset at 18:09. On the last day of the month, sunrise is at 06:11 and sunset at 18:23 -03.

Sunshine

In December, the average sunshine in Belém, Brazil, is 5.9h.

UV index

The months with the highest UV index are January through May, August through December, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In December, a regular UV index of 12 translates into these guidelines:
Employ every crucial safety step. Those with fair skin could experience burns in a matter of minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. A sunscreen with at least SPF 30 should be used liberally and reapplied frequently on cloudy days, especially after swimming or an outdoor workout. Beware! Reflecting off water and sand, UV rays are much stronger.