May weather forecast
São Félix do Piauí, Brazil

The last month of the autumn, May, is also a hot month in São Félix do Piauí, Brazil, with an average temperature fluctuating between 31.5°C (88.7°F) and 22.6°C (72.7°F).

Temperature

May notes an average high-temperature of a still tropical 31.5°C (88.7°F), subtly differing from April's 31.4°C (88.5°F). São Félix do Piauí reports an average low-temperature of 22.6°C (72.7°F) during the nights of May.

Heat index

The heat index in May is estimated at a scorching 41°C (105.8°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. 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. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In São Félix do Piauí, Brazil, the average relative humidity in May is 77%.

Rainfall

In São Félix do Piauí, in May, it is raining for 25.1 days, with typically 139mm (5.47") of accumulated precipitation. Throughout the year, there are 220.8 rainfall days, and 1560mm (61.42") of precipitation is accumulated.

Daylight

The average length of the day in May is 11h and 51min.
On the first day of May in São Félix do Piauí, sunrise is at 05:48 and sunset at 17:42. On the last day of the month, sunrise is at 05:52 and sunset at 17:40 -03.

Sunshine

In May, the average sunshine in São Félix do Piauí is 7.5h.

UV index

The average daily maximum UV index in May in São Félix do Piauí is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index, 7 during May, leads to the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. 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. Boost your sun resistance with garments that are densely woven yet spacious.