May weather forecast
São Francisco do Maranhão, Brazil

May, the last month of the autumn in São Francisco do Maranhão, is another tropical month, with an average temperature varying between 22.4°C (72.3°F) and 31.8°C (89.2°F).

Temperature

May brings a marginal elevation to a still hot 31.8°C (89.2°F) from April's 31.4°C (88.5°F) in São Francisco do Maranhão's average high-temperatures. The average temperature during May nights is registered at an agreeable 22.4°C (72.3°F).

Heat index

The heat index for May is computed to be a torrid 39°C (102.2°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In São Francisco do Maranhão, Brazil, the average relative humidity in May is 68%.

Rainfall

In São Francisco do Maranhão, during May, the rain falls for 13 days and regularly aggregates up to 34mm (1.34") of precipitation. In São Francisco do Maranhão, Brazil, during the entire year, the rain falls for 157.4 days and collects up to 636mm (25.04") of precipitation.

Daylight

In São Francisco do Maranhão, the average length of the day in May is 11h and 50min.
On the first day of May, sunrise is at 05:51 and sunset at 17:45. On the last day of the month, sunrise is at 05:55 and sunset at 17:42 -03.

Sunshine

The average sunshine in May in São Francisco do Maranhão is 8.2h.

UV index

The months with the lowest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In May, an average UV index of 7 transforms into the following instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.