April weather forecast
São Tomé, São Tomé and Príncipe

The weather becomes a mixed bag as April approaches. The temperature range remains static from 22.6°C (72.7°F) to 30.1°C (86.2°F) compared to March and something more distinct is noticeable. Despite the constant rainfall from the preceding month, the overall precipitation count lowers slightly. However, it's not all cloudy skies and dreariness, as the month actually sees the length of sunny periods remaining consistent with the earlier months.

Temperature

São Tomé's shift into April sets the average high-temperature at a still hot 30.1°C (86.2°F), a figure that deviates only slightly from March's 30.2°C (86.4°F). São Tomé reports an average nighttime low-temperature of 22.6°C (72.7°F) in April.

Heat index

Throughout April, the heat index is estimated at a sweltering 39°C (102.2°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. 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 are highly critical for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In São Tomé, the average relative humidity in April is 83%.

Rainfall

In April, the rain falls for 11 days. Throughout April, 122mm (4.8") of precipitation is accumulated. Throughout the year, there are 94 rainfall days, and 885mm (34.84") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater are February through April, with an average sea temperature of 29°C (84.2°F).
Note: For any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are deemed excellent and extremely satisfying for enduring periods.

Daylight

In April, the average length of the day is 12h and 7min.
On the first day of April in São Tomé, sunrise is at 05:33 and sunset at 17:40. On the last day of the month, sunrise is at 05:26 and sunset at 17:34 GMT.

Sunshine

In April, the average sunshine is 4.2h.

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 value of 11, and more, symbolizes an extreme health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In April, the maximum UV index of 12 suggests this advice:
Adopt every precaution of necessity, unprotected skin and eyes may suffer burns instantly. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Even on overcast days, apply and frequently reapply a sunscreen with SPF 30 or more, specifically after a swim or outdoor workout. Warning! Sand and water reflections boost the intensity of UV exposure.