December weather forecast
Arraial do Cabo, Brazil

December offers the warmest sea temperature of the year at 24°C (75.2°F). Coupled with the highest rainfall record of 101mm (3.98"), it embodies the wet-and-warm character of the tropical climate in Arraial do Cabo. Despite the rain, the city vibrates with energy and cheer as locals and tourists alike immerse themselves in end-of-year festivities. As daylight hours reach their peak, beachside activities and outdoor celebrations spill into the mild, balmy nights which offer a relief from the daytime heat.

Temperature

December shows a rise in the average high-temperature, moving from November's warm 29.5°C (85.1°F) to a hot 34.7°C (94.5°F). Arraial do Cabo marks a considerable descent from the daytime apex, as the average temperature dips to an agreeable 21.8°C (71.2°F) at night throughout December.

Heat index

The heat index value during December is computed to be a burning hot 57°C (134.6°F). Warning: These weather conditions are held as incredibly dangerous, heatstroke is on the horizon.
One should consider that heat index numbers are for shaded settings and light wind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

January through March, October through December, with an average relative humidity of 82%, are the most humid months.

Rainfall

December is the month with the most rainfall in Arraial do Cabo, with 101mm (3.98") of accumulated precipitation.

Sea temperature

In December, the average sea temperature in Arraial do Cabo is 24°C (75.2°F).
Note: Factor in your tolerance to cold, the sunshine, the wind, and the air's warmth, and a swim in 24°C (75.2°F) might be tempting. It is interesting to note that Olympians compete in 25°C (77°F) to 28°C (82.4°F) water temperatures.

Daylight

The month with the longest days is December, with an average of 13h and 30min of daylight.
On the first day of the month, sunrise is at 04:53 and sunset at 18:20. On the last day of December, in Arraial do Cabo, Brazil, sunrise is at 05:05 and sunset at 18:36 -03.