December weather forecast
Muaná, Brazil

The first month of the summer, December, is still a hot month in Muaná, Brazil, with an average temperature varying between 23.8°C (74.8°F) and 32°C (89.6°F).

Temperature

December's advent notes a subtle adjustment in average high-temperature to a still tropical 32°C (89.6°F) from November. Muaná experiences a steady low-temperature of 23.8°C (74.8°F) throughout December.

Heat index

During December, the heat index is calculated to be an extremely hot 44°C (111.2°F). Take note: Heat exhaustion and heat cramps are expected. Heatstroke can occur with prolonged effort.
In terms of the heat index, values are set with light wind and shade conditions in mind. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. 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 remain especially vital for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In December, the average relative humidity is 78%.

Rainfall

In December, the rain falls for 26.4 days. Throughout December, 151mm (5.94") of precipitation is accumulated. Throughout the year, there are 296.8 rainfall days, and 1567mm (61.69") of precipitation is accumulated.

Daylight

With an average of 12h and 12min of daylight, December has the longest days of the year.
On the first day of the month, sunrise is at 05:59 and sunset at 18:12. On the last day of December, sunrise is at 06:13 and sunset at 18:26 -03.

Sunshine

The average sunshine in December is 7.8h.

UV index

The months with the highest UV index are January through March, May through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily high UV index of 7 in December translates into this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.