May weather forecast
São Sebastião da Boa Vista, Brazil

The last month of the autumn, May, is another tropical month in São Sebastião da Boa Vista, Brazil, with temperature in the range of an average low of 23.3°C (73.9°F) and an average high of 31°C (87.8°F).

Temperature

Upon the beginning of May, São Sebastião da Boa Vista's high-temperatures register at a still tropical 31°C (87.8°F), closely mirroring the preceding month. The nighttime temperature, during May, averages of 23.3°C (73.9°F).

Heat index

Throughout May, the heat index is estimated at a blistering 43°C (109.4°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In May, the average relative humidity in São Sebastião da Boa Vista is 87%.

Rainfall

In São Sebastião da Boa Vista, during May, the rain falls for 29.7 days and regularly aggregates up to 225mm (8.86") of precipitation. Throughout the year, in São Sebastião da Boa Vista, there are 285.2 rainfall days, and 1825mm (71.85") of precipitation is accumulated.

Daylight

In May, the average length of the day is 12h and 2min.
On the first day of May, sunrise is at 06:13 and sunset at 18:16. On the last day of the month, sunrise is at 06:15 and sunset at 18:16 -03.

Sunshine

In São Sebastião da Boa Vista, the average sunshine in May is 7.8h.

UV index

The months with the highest UV index are May through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 during May leads to these advisories:
Prevent overexposure. Protection from the sun's harmful effects is needed. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Boost your sun resistance with garments that are densely woven yet spacious.