May weather forecast
São Fernando, Brazil

May, the last month of the autumn in São Fernando, is also a hot month, with an average temperature ranging between min 22.3°C (72.1°F) and max 32.5°C (90.5°F).

Temperature

The arrival of May brings an average high-temperature of a still hot 32.5°C (90.5°F), closely following the temperature pattern of April. São Fernando registers a consistent average low-temperature of 22.3°C (72.1°F) during May.

Heat index

In May, the average heat index is calculated to be a blisteringly hot 42°C (107.6°F). Exercise extra preventive actions, heat cramps and heat exhaustion are plausible. Continuous activity could result in heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. 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 highly critical for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

April and May, with an average relative humidity of 70%, are the most humid months in São Fernando.

Rainfall

In May, the rain falls for 16.9 days. Throughout May, 68mm (2.68") of precipitation is accumulated. Throughout the year, there are 122.6 rainfall days, and 442mm (17.4") of precipitation is accumulated.

Daylight

The average length of the day in May in São Fernando is 11h and 50min.
On the first day of the month, sunrise is at 05:29 and sunset at 17:22. On the last day of May, in São Fernando, sunrise is at 05:33 and sunset at 17:19 -03.

Sunshine

In May, the average sunshine is 8.8h.

UV index

The months with the highest UV index in São Fernando are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index, 7 in May, converts into the following recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.