December weather forecast
São Sebastião do Tocantins, Brazil

The first month of the summer, December, is still a tropical month in São Sebastião do Tocantins, Brazil, with an average temperature varying between 30.7°C (87.3°F) and 21.6°C (70.9°F).

Temperature

December's advent notes a subtle adjustment in average high-temperature to a still tropical 30.7°C (87.3°F) from November. During the nights in December, an average low-temperature of 21.6°C (70.9°F) is observed in São Sebastião do Tocantins.

Heat index

December's average heat index is evaluated at an extremely hot 41°C (105.8°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are highly critical for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in December in São Sebastião do Tocantins is 83%.

Rainfall

In December, the rain falls for 27.7 days. Throughout December, 195mm (7.68") of precipitation is accumulated. Throughout the year, in São Sebastião do Tocantins, there are 252.6 rainfall days, and 1607mm (63.27") of precipitation is accumulated.

Daylight

December has the longest days of the year in São Sebastião do Tocantins, with an average of 12h and 24min of daylight.
On the first day of the month, sunrise is at 05:49 and sunset at 18:14. On the last day of December, in São Sebastião do Tocantins, sunrise is at 06:03 and sunset at 18:28 -03.

Sunshine

In São Sebastião do Tocantins, the average sunshine in December is 7.5h.

UV index

The months with the lowest UV index in São Sebastião do Tocantins are January through June, October through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In December, an average UV index of 6 transforms into the following instructions:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.