May weather forecast
Teresina, Brazil

The month of May sees a considerable shift in Teresina's weather, as the city transitions to a remarkably drier and less cloudy period. Rainfall drops off sharply in comparison to April, highlighting the onset of the dry season. The clear sky results in increased sunshine hours, despite a marginal decrease in overall daylight hours. May also experiences a drastic drop in rainfall to just 87mm (3.43"), signifying a significant weather transformation in progress. Teresina's May is hence characterized by a warmer, sunnier, and drier spell.

Temperature

The temperature hits its lowest levels in April and May, recording an average high-temperature of 31.3°C (88.3°F).

Heat index

The heat index value during May is calculated to be an extremely hot 41°C (105.8°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', arises from combining readings of air temperature and relative moisture content. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

The average relative humidity in May in Teresina, Brazil, is 78%.

Rainfall

In Teresina, during May, the rain falls for 20.6 days and regularly aggregates up to 87mm (3.43") of precipitation. Throughout the year, in Teresina, there are 207.4 rainfall days, and 1348mm (53.07") of precipitation is accumulated.

Daylight

In Teresina, the average length of the day in May is 11h and 53min.
On the first day of May, sunrise is at 05:50 and sunset at 17:46. On the last day of the month, sunrise is at 05:53 and sunset at 17:44 -03.

Sunshine

The average sunshine in May is 7.9h.

UV index

January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Teresina. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in May converts into the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.