May weather forecast
Vilhena, Brazil

The last month of the autumn, May, is another warm month in Vilhena, Brazil, with temperature in the range of an average low of 19.2°C (66.6°F) and an average high of 29.1°C (84.4°F).

Temperature

April's transformation into May witnesses an average high-temperature of a still moderately hot 29.1°C (84.4°F), noting a minor change from the preceding month. Vilhena's nighttime temperature in May falls to an average of 19.2°C (66.6°F).

Heat index

The heat index in May is evaluated at a fiery hot 35°C (95°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Note that heat index values are valued for light wind and location in the shade. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The average relative humidity in May in Vilhena is 80%.

Rainfall

In Vilhena, in May, during 18.7 rainfall days, 69mm (2.72") of precipitation is typically accumulated. In Vilhena, Brazil, during the entire year, the rain falls for 237.8 days and collects up to 1557mm (61.3") of precipitation.

Daylight

In May, the average length of the day is 11h and 32min.
On the first day of May, sunrise is at 06:08 and sunset at 17:46. On the last day of the month, sunrise is at 06:15 and sunset at 17:41 -04.

Sunshine

In Vilhena, the average sunshine in May is 6.8h.

UV index

In May, the average daily maximum UV index in Vilhena is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: An average maximum UV index of 6 in May leads to these recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.