August weather forecast
Castanhal, Brazil

August, the last month of the winter in Castanhal, is another tropical month, with temperature in the range of an average high of 32.5°C (90.5°F) and an average low of 21.9°C (71.4°F).

Temperature

The introduction of August sees an average high-temperature of a still hot 32.5°C (90.5°F), hardly deviating from July. Castanhal reports an average nighttime low-temperature of 21.9°C (71.4°F) in August.

Heat index

The average heat index in August is calculated to be a life-threatening hot 47°C (116.6°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In Castanhal, the average relative humidity in August is 81%.

Rainfall

In Castanhal, Brazil, in August, during 27.1 rainfall days, 51mm (2.01") of precipitation is typically accumulated. Throughout the year, in Castanhal, there are 332.9 rainfall days, and 1589mm (62.56") of precipitation is accumulated.

Daylight

The average length of the day in August is 12h and 4min.
On the first day of the month, sunrise is at 06:16 and sunset at 18:19. On the last day of August, sunrise is at 06:09 and sunset at 18:14 -03.

Sunshine

The month with the most sunshine is August, with an average of 8.6h of sunshine.

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 risk from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 6 during August translates into the following directions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.