December weather forecast
São João do Caiuá, Brazil

December, the first month of the summer in São João do Caiuá, is also a moderately hot month, with an average temperature varying between 20.6°C (69.1°F) and 29.8°C (85.6°F).

Temperature

With the start of December, São João do Caiuá measures an average high-temperature of a moderately hot 29.8°C (85.6°F), not significantly differing from November's 30°C (86°F). The nighttime temperature in São João do Caiuá, Brazil, dips to a pleasant 20.6°C (69.1°F) on average during December.

Heat index

The heat index for December is estimated at a fiery hot 37°C (98.6°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. 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.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. 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. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

In São João do Caiuá, Brazil, the average relative humidity in December is 80%.

Rainfall

In São João do Caiuá, in December, during 24.7 rainfall days, 173mm (6.81") of precipitation is typically accumulated. Throughout the year, there are 188.5 rainfall days, and 1243mm (48.94") of precipitation is accumulated.

Daylight

With an average of 13h and 30min of daylight, December has the longest days of the year in São João do Caiuá.
On the first day of the month, sunrise is at 05:35 and sunset at 19:01. On the last day of December, sunrise is at 05:47 and sunset at 19:18 -03.

Sunshine

In December, the average sunshine in São João do Caiuá, Brazil, is 8h.

UV index

The months with the highest UV index are January through March, August through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 6 in December interprets into the following recommendations:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.