April weather forecast
São Fernando, Brazil

April, the same as March, in São Fernando, Brazil, is another hot autumn month, with an average temperature fluctuating between 33.1°C (91.6°F) and 22.8°C (73°F).

Temperature

As São Fernando steps into April, the average high-temperature holds at a still tropical 33.1°C (91.6°F), hinting at a minor fluctuation from the prior month. In April, São Fernando's temperature tends to fall to an average low of 22.8°C (73°F) during the night.

Heat index

For most parts of April, the heat index is calculated to be a blisteringly hot 44°C (111.2°F). Take note: Heat exhaustion and heat cramps are expected. Heatstroke can occur with prolonged effort.
The metrics for the heat index are tailored for both shady environments and light winds. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. 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 remain especially vital for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

The months with the highest humidity in São Fernando are April and May, with an average relative humidity of 70%.

Rainfall

In São Fernando, during April, the rain falls for 21.5 days and regularly aggregates up to 101mm (3.98") of precipitation. In São Fernando, during the entire year, the rain falls for 122.6 days and collects up to 442mm (17.4") of precipitation.

Daylight

In São Fernando, the average length of the day in April is 11h and 58min.
On the first day of the month, sunrise is at 05:31 and sunset at 17:33. On the last day of April, in São Fernando, Brazil, sunrise is at 05:29 and sunset at 17:22 -03.

Sunshine

In April, the average sunshine is 8.7h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 7 during April translates into the following guidance:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.