May weather forecast
Iaçu, Brazil

May, the last month of the autumn in Iaçu, is another warm month, with an average temperature ranging between max 29.2°C (84.6°F) and min 19.5°C (67.1°F).

Temperature

Stepping into May, Iaçu records an average high-temperature of a warm 29.2°C (84.6°F), almost consistent with April. An average low-temperature of 19.5°C (67.1°F) is observed during May nights.

Heat index

May's mean heat index is computed to be a torrid 35°C (95°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

With an average relative humidity of 78%, May is the most humid month.

Rainfall

In May, the rain falls for 15.1 days. Throughout May, 24mm (0.94") of precipitation is accumulated. In Iaçu, during the entire year, the rain falls for 185.3 days and collects up to 502mm (19.76") of precipitation.

Daylight

The average length of the day in May is 11h and 32min.
On the first day of May, sunrise is at 05:48 and sunset at 17:27. On the last day of the month, sunrise is at 05:55 and sunset at 17:21 -03.

Sunshine

In May, the average sunshine is 5.1h.

UV index

In Iaçu, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: An average UV index of 6 in May transforms into this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.