May weather forecast
Santo Antonio, São Tomé and Príncipe

May, the last month of the spring in Santo Antonio, is another warm month, with temperature in the range of an average high of 28.8°C (83.8°F) and an average low of 21.9°C (71.4°F).

Temperature

In Santo Antonio, the average high-temperature in May is almost the same as in April - a still warm 28.8°C (83.8°F). The average low-temperature, in May, is 21.9°C (71.4°F).

Heat index

The average heat index in May is appraised at a very hot 36°C (96.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, wind), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in May in Santo Antonio is 88%.

Rainfall

In Santo Antonio, during May, the rain falls for 18 days and regularly aggregates up to 229mm (9.02") of precipitation. In Santo Antonio, during the entire year, the rain falls for 188 days and collects up to 1872mm (73.7") of precipitation.

Sea temperature

The months with the warmest seawater are February through May, with an average sea temperature of 29°C (84.2°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Santo Antonio, the average length of the day in May is 12h and 11min.
On the first day of May, sunrise is at 05:22 and sunset at 17:32. On the last day of the month, sunrise is at 05:21 and sunset at 17:34 GMT.

Sunshine

The months with the most sunshine are January through June, November and December, with an average of 4h of sunshine.

UV index

The months with the highest UV index are January through May, August through November, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 12 in May interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. 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-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.