May weather forecast
Santo Antonio, São Tomé and Príncipe

Like April, the weather in May in Santo Antonio also sees high rainfall, but with a marginal decrease to 229mm (9.02"). In comparison to the subsequent June, May has wetter and warmer weather. Sea temperatures remain warm, making May an excellent month for water activities despite the rain. Periods of sunshine and drizzle intersperse throughout the month. Verdant landscapes flourish due to the weather conditions, perfect for picturesque walks.

Temperature

Santo Antonio, São Tomé and Príncipe, records an average high-temperature of a still moderately hot 28.8°C (83.8°F) in May, closely mirroring the climate of the previous month. Santo Antonio, in May, observes a steady average low-temperature of 21.9°C (71.4°F).

Heat index

For May, the heat index is computed to be a very hot 36°C (96.8°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In May, the average relative humidity is 88%.

Rainfall

In Santo Antonio, in May, it is raining for 18 days, with typically 229mm (9.02") of accumulated precipitation. Throughout the year, in Santo Antonio, São Tomé and Príncipe, there are 188 rainfall days, and 1872mm (73.7") of precipitation is accumulated.

Sea temperature

February through May, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Santo Antonio.
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

The average length of the day in May is 12h and 11min.
On the first day of May in Santo Antonio, 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 in Santo Antonio are January through June, November and December, with an average of 4h of sunshine.

UV index

The months with the highest UV index in Santo Antonio, São Tomé and Príncipe, 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 excessive health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, a daily maximum UV index of 12 leads to the following instructions:
Execute every important safeguard, as unprotected skin and eyes could burn within moments. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Directly after outdoor activities or swimming, a broad-spectrum sunscreen with SPF 30+ should be applied generously and reapplied frequently. Take note! Sand and water reflections strengthen the Sun's UV exposure.