April weather forecastCastanhal, Brazil

April

Weather in April

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.

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

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

In Castanhal, 29.7°C (85.5°F) is the average high-temperature and 22.8°C (73°F) is the average low-temperature during April. In April, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 40°C (104°F).

With an average relative humidity of 92%, April is the most humid month in Castanhal, Brazil.

In April, the average relative humidity in Castanhal, Brazil, is 92%.

In April, in Castanhal, Brazil, the rain falls for 29.9 days. Throughout April, 249mm (9.8") of precipitation is accumulated.

In April, the average day length in Castanhal, Brazil, is 12h and 5min.

In April, on the first day of the month, sunrise is at 06:12 and sunset at 18:18. On the last day of the month, sunrise is at 06:06 and sunset at 18:10 -03.

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

January through April, June, August and December, with an average maximum UV index of 6, are months with the lowest UV index in Castanhal.

The average daily maximum UV index in April in Castanhal, Brazil, is 6. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M April M J J A S O N D

Mar

April

May

Average high temperature

29.7°C

30.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.7km/h

5.4km/h

5.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

0.3

Average UV index

Average cloud cover

Average visibility

Average temperature in April
Castanhal, Brazil

Average high temperature in April: 29.7°C

The warmest months (with the highest average high temperature) are October and November (33.5°C).
The months with the lowest average high temperature are March and April (29.7°C).

Average low temperature in April: 22.8°C

The month with the highest average low temperature is December (23°C).
The coldest month (with the lowest average low temperature) is July (21.5°C).

Average pressure in April
Castanhal, Brazil

Average pressure in April: 1010.9mbar

The month with the highest atmospheric pressure is July (1012.7mbar).
The month with the lowest atmospheric pressure is November (1009.2mbar).

Average wind speed in April
Castanhal, Brazil

Average wind speed in April: 4.8km/h

The windiest months (with the highest average wind speed) are September, October and November (6.9km/h).
The calmest month (with the lowest average wind speed) is April (4.8km/h).

Average humidity in April
Castanhal, Brazil

Average humidity in April: 92%

The month with the highest relative humidity is April (92%).
The month with the lowest relative humidity is November (76%).

Average rainfall in April
Castanhal, Brazil

Average rainfall in April: 249mm

The wettest month (with the highest rainfall) is March (252mm).
The driest month (with the least rainfall) is September (45mm).

Average rainfall days in April
Castanhal, Brazil

Average rainfall days in April: 29.9 days

The month with the highest number of rainy days is March (30.8 days).
The month with the least rainy days is November (22.2 days).

Average daylight in April /
Average sunshine in April
Castanhal, Brazil

Average daylight in April: 12h and 6min

The month with the longest days is December (Average daylight: 12h and 12min).
The month with the shortest days is June (Average daylight: 12h and 0min).

Average sunshine in April: 5h and 48min

The month with the most sunshine is August (Average sunshine: 8h and 36min).
The month with the least sunshine is March (Average sunshine: 5h and 36min).

Average sunshine days in April
Castanhal, Brazil

Average sunshine days in April: 0 days

The month with the most sunshine days is November (6 days).
The months with the least sunshine days are March and April (0 days).

Average UV index in April
Castanhal, Brazil

Average UV index in April: 6

The months with the highest UV index are May, July, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March, April, June, August and December (UV index 6).

Average cloud cover in April
Castanhal, Brazil

Average cloud cover in April: 71

The months with the most cloud cover are March and April (Cloud cover 71).
The months with the least cloud cover are October and November (Cloud cover 44).