May weather forecast
Santarém, Brazil

May, the last month of the autumn in Santarém, is another warm month, with temperature in the range of an average high of 29.8°C (85.6°F) and an average low of 24.2°C (75.6°F).

Temperature

The shift to May signals an average high-temperature of a still warm 29.8°C (85.6°F), subtly varied from April's 29.3°C (84.7°F). During May, the temperature in Santarém is averaged to a low of 24.2°C (75.6°F) at night.

Heat index

In May, the heat index is evaluated at a torrid 38°C (100.4°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In Santarém, the average relative humidity in May is 84%.

Rainfall

In Santarém, during May, the rain falls for 29.2 days and regularly aggregates up to 305mm (12.01") of precipitation. In Santarém, during the entire year, the rain falls for 259.2 days and collects up to 2234mm (87.95") of precipitation.

Daylight

In May, the average length of the day is 12h and 1min.
On the first day of May in Santarém, sunrise is at 06:35 and sunset at 18:36. On the last day of the month, sunrise is at 06:36 and sunset at 18:36 -03.

Sunshine

The average sunshine in May in Santarém, Brazil, is 8h.

UV index

January, April through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 7 in May translates into these instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.