May weather forecast
São Francisco do Piauí, Brazil

May, the last month of the autumn in São Francisco do Piauí, is another hot month, with an average temperature fluctuating between 32.2°C (90°F) and 21.8°C (71.2°F).

Temperature

The arrival of May brings an average high-temperature of a still hot 32.2°C (90°F), closely following the temperature pattern of April. During May, the temperature tends to dip to an average of 21.8°C (71.2°F) at night.

Heat index

The heat index value for May is computed to be a blisteringly hot 40°C (104°F). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. 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 May, the average relative humidity is 67%.

Rainfall

In São Francisco do Piauí, during May, the rain falls for 12.3 days and regularly aggregates up to 43mm (1.69") of precipitation. In São Francisco do Piauí, during the entire year, the rain falls for 159.4 days and collects up to 844mm (33.23") of precipitation.

Daylight

The average length of the day in May is 11h and 47min.
On the first day of May in São Francisco do Piauí, Brazil, sunrise is at 05:51 and sunset at 17:42. On the last day of the month, sunrise is at 05:56 and sunset at 17:39 -03.

Sunshine

In São Francisco do Piauí, the average sunshine in May is 8.3h.

UV index

In May, the average daily maximum UV index in São Francisco do Piauí is 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 7 in May interprets into the following advice:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. 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. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.