July weather forecast
Castanhal, Brazil

July, the same as June, in Castanhal, Brazil, is another tropical winter month, with an average temperature ranging between max 31.5°C (88.7°F) and min 21.5°C (70.7°F).

Temperature

The commencement of July introduces an average high-temperature of a still hot 31.5°C (88.7°F), closely mirroring the preceding month. Throughout July, the average low-temperature dips to a pleasant 21.5°C (70.7°F).

Heat index

For most parts of July, the heat index is calculated to be a scorching 44°C (111.2°F). Guard: Heat exhaustion and heat cramps are foreseeable. Prolonged effort may bring about heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. 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 are especially crucial for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In July, the average relative humidity is 84%.

Rainfall

In July, the rain falls for 28.7 days. Throughout July, 77mm (3.03") 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 average length of the day in July is 12h and 3min.
On the first day of July, sunrise is at 06:14 and sunset at 18:17. On the last day of the month, sunrise is at 06:16 and sunset at 18:19 -03.

Sunshine

In Castanhal, the average sunshine in July is 8.2h.

UV index

The months with the highest UV index are May, July, September through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 7 in July transforms into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.