April weather forecast
Altamira, Brazil

April, like March, in Altamira, Brazil, is another warm autumn month, with an average temperature varying between 29.7°C (85.5°F) and 22.4°C (72.3°F).

Temperature

April's onset records a minor alteration in the average high-temperature to a still moderately hot 29.7°C (85.5°F) from March's 29.6°C (85.3°F). Throughout the month of April, the nighttime temperature in Altamira dips to an average of 22.4°C (72.3°F).

Heat index

April's average heat index is evaluated at an extremely hot 40°C (104°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

With an average relative humidity of 91%, April is the most humid month.

Rainfall

The month with the most rainfall in Altamira, Brazil, is April, when the rain falls for 29 days and typically aggregates up to 207mm (8.15") of precipitation.

Daylight

The average length of the day in April is 12h and 2min.
On the first day of the month, sunrise is at 06:30 and sunset at 18:34. On the last day of April, sunrise is at 06:25 and sunset at 18:26 -03.

Sunshine

In April, the average sunshine is 5.8h.

UV index

The months with the lowest UV index are January through May, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In April, the maximum UV index of 6 suggests these recommendations:
Deflect overexposure. Sun protection is a necessity. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.