May weather forecast
São Tomé, São Tomé and Príncipe

May witnesses a decline in the mercury levels. When juxtaposing it with April, the month shows a downshift while the mounting rainfall provides relief. The overall temperature decreases slightly, settling within the neighbourhood of the earlier spells. Contrasted with the increase in rainfall, ocean temperatures remain quite stable. The Sun continues to shine, making the idiosyncratic São Tomé weather more intriguing.

Temperature

São Tomé, São Tomé and Príncipe, experiences a transition to a moderately hot 29.3°C (84.7°F) in average high-temperatures with the arrival of May, not greatly differing from April's 30.1°C (86.2°F). An average low-temperature of 22.6°C (72.7°F) is expected in São Tomé during May.

Heat index

The heat index value for May is calculated to be a sweltering 37°C (98.6°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

The average relative humidity in May is 84%.

Rainfall

In São Tomé, during May, the rain falls for 10 days and regularly aggregates up to 113mm (4.45") of precipitation. Throughout the year, in São Tomé, there are 94 rainfall days, and 885mm (34.84") of precipitation is accumulated.

Sea temperature

In São Tomé, in May, the average water temperature is 28°C (82.4°F).
Note: For engaging in any water activities, temperatures from 25°C (77°F) to 29°C (84.2°F) are viewed as outstanding and exceptionally pleasing for prolonged durations.

Daylight

In São Tomé, the average length of the day in May is 12h and 8min.
On the first day of the month, sunrise is at 05:26 and sunset at 17:33. On the last day of May, sunrise is at 05:26 and sunset at 17:35 GMT.

Sunshine

The average sunshine in May is 4.7h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 12 suggests this advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim. Be attentive! The UV exposure is heightened with reflections from sand and water.