January weather forecast
Caldeiras, São Tomé and Príncipe

In São Tomé and Príncipe's tropical island of Caldeiras, January boasts a high average temperature of 28°C (82.4°F) and a low of 27°C (80.6°F) with relative humidity of 77%. Dominated by tropical rains, the city experiences 130mm (5.12") of rainfall spanning across 27 days. Despite the downpours, there are still opportunities for sunbathing with an average of 8.3 hours of sunshine. The verdant vegetation thrives under these conditions, making January a visually stunning time to explore the island’s natural attractions. The steady sea-breezes also make for exciting water-sport activities.

Temperature

The advent of January in Caldeiras denotes an average high-temperature of a still warm 28°C (82.4°F), subtly different from December's 27.5°C (81.5°F). In Caldeiras, the average low-temperature during January nights tends to settle at a still moderately hot 27°C (80.6°F), indicating a slight drop from the daytime peak.

Heat index

The heat index in January is calculated to be a tropical 32°C (89.6°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Know that the heat index computations account for shaded terrains and slight winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.

Humidity

In January, the average relative humidity is 77%.

Rainfall

In Caldeiras, during January, the rain falls for 27.1 days and regularly aggregates up to 130mm (5.12") of precipitation. In Caldeiras, during the entire year, the rain falls for 241.7 days and collects up to 1287mm (50.67") of precipitation.

Daylight

In January, the average length of the day in Caldeiras, São Tomé and Príncipe, is 12h and 6min.
On the first day of the month, sunrise is at 05:33 and sunset at 17:39. On the last day of January, in Caldeiras, sunrise is at 05:43 and sunset at 17:49 GMT.

Sunshine

In Caldeiras, São Tomé and Príncipe, the average sunshine in January is 8.3h.

UV index

The months with the highest UV index are January through May, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 7 during January, leads to the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.