January weather forecast
São Tomé, São Tomé and Príncipe

January commences the year with balmy weather in São Tomé, São Tomé and Príncipe. The temperature flexes between 22.4°C (72.3°F) at its chilliest and 29.4°C (84.9°F) when it reaches its zenith. This serves as an introductory phase to the climatic journey of the year. As compared to December, the barometer drops slightly while humidity remains fairly constant. Intermittent showers and a moderate level of sunshine percolating through the clouds characterize this opening month.

Temperature

Transitioning from December to January, São Tomé observes an average high-temperature of a still warm 29.4°C (84.9°F), differing subtly from the previous month. In January, the average low-temperature records at an agreeable 22.4°C (72.3°F) during the nights.

Heat index

The heat index for January is estimated at a very hot 37°C (98.6°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index determinations are made taking into account the shade and light air movements. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a value derived by merging air temperature with the humidity to convey how the climate feels. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

January, November and December, with an average relative humidity of 85%, are the most humid months.

Rainfall

In São Tomé, during January, the rain falls for 8 days and regularly aggregates up to 81mm (3.19") of precipitation. Throughout the year, there are 94 rainfall days, and 885mm (34.84") of precipitation is accumulated.

Sea temperature

In January, the average sea temperature is 28°C (82.4°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

The average length of the day in January is 12h and 7min.
On the first day of the month, sunrise is at 05:33 and sunset at 17:39. On the last day of January, sunrise is at 05:43 and sunset at 17:49 GMT.

Sunshine

In January, the average sunshine in São Tomé is 4.6h.

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 threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 12 during January translates into the following guidance:
Implement all key precautions. Warding off sun damage is critical. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Directly after swimming or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Caution! The Sun's UV rays become stronger due to reflections from water and sand.