December weather forecast
Foz do Iguaçu, Brazil

Wrapping up the year, December in Foz do Iguaçu is truly summertime, with temperatures soaring as high as 32.6°C (90.7°F). Add to this the yearly second highest rain accumulation at 189mm (7.44"), and one gets the typical elements of a tropical summer. Maximized daylight hours enhance the city's vibrant atmosphere. December's weather in Foz do Iguaçu reflects the peak of summer, with its distinctive combination of heat, rain, and abundant sunshine.

Temperature

Transitioning from November to December, Foz do Iguaçu observes an average high-temperature of a still hot 32.6°C (90.7°F), differing subtly from the previous month. The anticipated average low-temperature for December, an enjoyable 18.6°C (65.5°F), shows a substantial deviation from the daytime maximums.

Heat index

In December, the heat index is computed to be an extremely hot 44°C (111.2°F). Stay watchful: Heat exhaustion along with heat cramps are likely. Ongoing effort may cause heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are primarily vital for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

December is the least humid month, with an average relative humidity of 74%.

Rainfall

In Foz do Iguaçu, in December, during 9 rainfall days, 189mm (7.44") of precipitation is typically accumulated. Throughout the year, there are 95 rainfall days, and 1869mm (73.58") of precipitation is accumulated.

Daylight

December has the longest days of the year in Foz do Iguaçu, with an average of 13h and 42min of daylight.
On the first day of the month, sunrise is at 05:39 and sunset at 19:16. On the last day of December, in Foz do Iguaçu, sunrise is at 05:50 and sunset at 19:32 -03.

Sunshine

The average sunshine in December in Foz do Iguaçu is 7.5h.

UV index

January, February, November and December, with an average maximum UV index of 12, are months with the highest UV index in Foz do Iguaçu. A UV Index estimate of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 12 translates into these guidelines:
Utilize all vital precautions. Guarding against sun harm is non-negotiable. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Opt for tightly woven and loose clothing to enhance protection from the Sun. After a swim or an outdoor workout, generously apply and regularly reapply a sunscreen with at least SPF 30, even if the day is cloudy.