December weather forecast
Angra dos Reis, Brazil

Concluding the year in Angra dos Reis is a display of true tropical weather. Remarkably, the sea temperature stands at 24.1°C (75.4°F), indicating the culmination of the year and climatic cycle. The temperature stays in the mid to high 20s°C, accompanying a dramatic increase in rainfall. The city faces the highest rainfall of the year, reinstating its tropical image. Despite the weather changes, sunshine hours and UV index remain constant.

Temperature

Angra dos Reis's average high-temperature marks a still moderately hot 28.6°C (83.5°F) with the advent of December, closely mirroring that of the preceding month. In December, the recorded average low-temperature is a pleasant 21.7°C (71.1°F).

Heat index

The heat index for December is calculated to be a hot 34°C (93.2°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. 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 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in December in Angra dos Reis, Brazil, is 82%.

Rainfall

In Angra dos Reis, Brazil, during December, the rain falls for 20 days and regularly aggregates up to 265mm (10.43") of precipitation. In Angra dos Reis, during the entire year, the rain falls for 165 days and collects up to 1977mm (77.83") of precipitation.

Sea temperature

In December, the average sea temperature in Angra dos Reis, Brazil, is 24.1°C (75.4°F).
Note: Your comfort in 24.1°C (75.4°F) waters hinges on your relationship with the cold, today's sunny disposition, wind patterns, and the air's temperature. For context, Olympic swimmers are no strangers to waters of 25°C (77°F) to 28°C (82.4°F).

Daylight

December has the longest days of the year, with an average of 13h and 30min of daylight.
On the first day of the month, sunrise is at 05:03 and sunset at 18:29. On the last day of December, sunrise is at 05:14 and sunset at 18:46 -03.

Sunshine

September through December, with an average of 4h of sunshine, are months with the least sunshine.

UV index

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV radiation for average individuals.
Note: In December, the maximum UV index of 12 transforms into these recommendations:
Carry out all crucial safety measures, unprotected skin may burn instantly. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Apply and frequently reapply a minimum SPF 30 sunscreen even on cloudy days, especially after swimming or an outdoor workout. Caution! The Sun's UV rays become stronger due to reflections from water and sand.