June weather forecast
Castanhal, Brazil

The first month of the winter, June, is still a tropical month in Castanhal, Brazil, with an average temperature fluctuating between 31°C (87.8°F) and 22°C (71.6°F).

Temperature

Castanhal registers an average high-temperature of a still hot 31°C (87.8°F) with the arrival of June, showing minor deviation from the preceding month. During the month of June, Castanhal anticipates a mean low-temperature of 22°C (71.6°F).

Heat index

During June, the heat index is calculated to be an extremely hot 43°C (109.4°F). Alert: Heat cramps and heat exhaustion are likely to occur. Prolonged exertion can lead to heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Castanhal, the average relative humidity in June is 87%.

Rainfall

In June, in Castanhal, the rain falls for 28.3 days. Throughout June, 109mm (4.29") of precipitation is accumulated. Throughout the year, in Castanhal, there are 332.9 rainfall days, and 1589mm (62.56") of precipitation is accumulated.

Daylight

The month with the shortest days in Castanhal is June, with an average of 12h and 0min of daylight.
On the first day of June, sunrise is at 06:08 and sunset at 18:11. On the last day of the month, sunrise is at 06:14 and sunset at 18:16 -03.

Sunshine

In June, the average sunshine is 7.7h.

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. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In June, the maximum UV index of 6 suggests these recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.