May weather forecast
São José do Piauí, Brazil

May, the last month of the autumn in São José do Piauí, is another tropical month, with an average temperature ranging between min 20.9°C (69.6°F) and max 31.6°C (88.9°F).

Temperature

The average high-temperature is a still tropical 31.6°C (88.9°F) in May, hardly different from the 31.3°C (88.3°F) recorded in April. São José do Piauí's average low-temperature for the month of May records at a pleasant 20.9°C (69.6°F).

Heat index

May's average heat index is appraised at a torrid 39°C (102.2°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', joins air temperature with relative humidity to produce a temperature perception for humans. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In May, the average relative humidity is 69%.

Rainfall

In São José do Piauí, in May, during 12.7 rainfall days, 47mm (1.85") of precipitation is typically accumulated. In São José do Piauí, during the entire year, the rain falls for 152.5 days and collects up to 872mm (34.33") of precipitation.

Daylight

In São José do Piauí, the average length of the day in May is 11h and 48min.
On the first day of May, sunrise is at 05:46 and sunset at 17:38. On the last day of the month, sunrise is at 05:51 and sunset at 17:36 -03.

Sunshine

The average sunshine in May is 8.4h.

UV index

The average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In May, the maximum UV index of 7 transforms into these recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.