April weather forecast
Santo Antonio, São Tomé and Príncipe

Santo Antonio's weather takes a turn in April, with a significant increase in precipitation to an average of 233mm (9.17"). Side by side with March, April weather exhibits a similar temperature range but differs notably in terms of rainfall. The length of daylight averages at 12.2 hours, giving ample time to explore outdoors. Humidity remains relatively high, aiding in the tropical radiance of the city. Easterly winds carry drizzle followed by bright, overcast skies.

Temperature

Upon the onset of April, Santo Antonio witnesses an average high-temperature of a still warm 29.4°C (84.9°F), showing a close resemblance to the prior month. April's average low-temperature reading settles at a pleasant 22.1°C (71.8°F).

Heat index

April's average heat index is computed to be a fiery hot 38°C (100.4°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in April in Santo Antonio is 87%.

Rainfall

In Santo Antonio, during April, the rain falls for 18 days and regularly aggregates up to 233mm (9.17") of precipitation. Throughout the year, 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: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

The average length of the day in April in Santo Antonio, São Tomé and Príncipe, is 12h and 9min.
On the first day of April in Santo Antonio, sunrise is at 05:30 and sunset at 17:38. On the last day of the month, sunrise is at 05:22 and sunset at 17:32 GMT.

Sunshine

The months with the most sunshine in Santo Antonio, São Tomé and Príncipe, 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 are January through May, August through November, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In April, a daily maximum UV index of 12 leads to the following instructions:
Adopt every precaution of necessity, unprotected skin and eyes may suffer burns instantly. 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. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Frequent application of a broad-spectrum SPF 30+ sunscreen is crucial, reapply it every two hours or immediately post swimming or outdoor exercise. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.