April weather forecast
Castanhal, Brazil

April, the same as March, is another warm autumn month in Castanhal, Brazil, with an average temperature varying between 29.7°C (85.5°F) and 22.8°C (73°F).

Temperature

During March and April, Castanhal registers its lowest temperatures, averaging a high of 29.7°C (85.5°F).

Heat index

During April, the heat index is calculated to be an extremely hot 40°C (104°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

April is the most humid month, with an average relative humidity of 92%.

Rainfall

In Castanhal, Brazil, during April, the rain falls for 29.9 days and regularly aggregates up to 249mm (9.8") of precipitation. Throughout the year, there are 332.9 rainfall days, and 1589mm (62.56") of precipitation is accumulated.

Daylight

In Castanhal, Brazil, the average length of the day in April is 12h and 5min.
On the first day of the month, sunrise is at 06:12 and sunset at 18:18. On the last day of April, sunrise is at 06:06 and sunset at 18:10 -03.

Sunshine

In Castanhal, the average sunshine in April is 5.8h.

UV index

January through April, June, August and December, with an average maximum UV index of 6, are months with the lowest UV index in Castanhal, Brazil. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In April, the maximum UV index of 6 transforms into these recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Enhance your sun protection with tightly woven, yet airy clothing.