April weather forecast
São José do Piauí, Brazil

April, the same as March, in São José do Piauí, Brazil, is another tropical autumn month, with an average temperature varying between 31.3°C (88.3°F) and 21.3°C (70.3°F).

Temperature

In São José do Piauí, the months of March and April are known for the lowest temperatures, reaching an average high of 31.3°C (88.3°F).

Heat index

For most parts of April, the heat index is appraised at a blistering 40°C (104°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In São José do Piauí, Brazil, the average relative humidity in April is 75%.

Rainfall

In April, the rain falls for 21.3 days. Throughout April, 142mm (5.59") of precipitation is accumulated. Throughout the year, there are 152.5 rainfall days, and 872mm (34.33") of precipitation is accumulated.

Daylight

The average length of the day in April is 11h and 57min.
On the first day of the month, sunrise is at 05:48 and sunset at 17:50. On the last day of April, sunrise is at 05:46 and sunset at 17:39 -03.

Sunshine

April has the least sunshine of the year, with an average of 7.6h of sunshine.

UV index

February and April, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 6 in April translates into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.