São Tomé
São Tomé and Príncipe
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
São Tomé, São Tomé and Príncipe

Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach
Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach
The first month of the winter, December, is also a moderately hot month in São Tomé, São Tomé and Príncipe, with temperature in the range of an average high of 29.1°C (84.4°F) and an average low of 22.1°C (71.8°F).

Temperature

In São Tomé, the average high-temperature is almost the same as in November - a still warm 29.1°C (84.4°F). In December, the average low-temperature is 22.1°C (71.8°F).

Heat index

In December, the average heat index is appraised at a very hot 36.2°C (97.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

Months with the highest humidity are January, November and December, with an average relative humidity of 85%.

Rainfall

In São Tomé, during December, the rain falls for 8 days and regularly aggregates up to 108mm (4.3") of precipitation. In São Tomé, during the entire year, the rain falls for 94 days and collects up to 885mm (34.8") of precipitation.

Sea temperature

In December, the average sea temperature is 28°C (82.4°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

January through December, with an average of 12.1h of daylight, are months with the longest days in São Tomé. Months with the shortest days are January through December, with an average of 12.1h of daylight.

Sunshine

In December, the average sunshine is 4.6h.

UV index

Months with the highest UV index are January through May, August through December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 12 in December interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in São Tomé?

In São Tomé, in December, the average high-temperature is 29.1°C (84.4°F), and the average low-temperature is 22.1°C (71.8°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, in December is calculated to 36.2°C (97.2°F).

What are the most humid months in São Tomé?

Months with the highest humidity are January, November and December, with an average relative humidity of 85%.

What is the average humidity in December in São Tomé?

The average relative humidity in December in São Tomé is 85%.

How much does it rain in São Tomé in December?

In São Tomé, in December, it is raining for 8 days, with typically 108mm (4.3") of accumulated precipitation.

What is the water temperature in December in São Tomé?

In São Tomé, the average seawater temperature in December is 28°C (82.4°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

When are the longest days in São Tomé?

Months with the longest days in São Tomé are January through December, with an average of 12.1h of daylight.

What is the month with the shortest days in São Tomé?

January through December, with an average of 12.1h of daylight, are months with the shortest days.

What is the average length of the day in December in São Tomé?

The average length of the day in December in São Tomé is 12.1h.

How long on average sun shines in December in São Tomé?

In São Tomé, São Tomé and Príncipe, the average sunshine in December is 4.6h.

What is the month with the highest UV index in São Tomé?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index reading in December in São Tomé?

The average daily maximum UV index in December in São Tomé is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - São Tomé, São Tomé and Príncipe
  • Average high temperature in December: 29.1°C

The warmest month (with the highest average high temperature) is March (30.2°C).
The month with the lowest average high temperature is July (27.3°C).

  • Average low temperature in December: 22.1°C

Months with the highest average low temperature are March, April and May (22.6°C).
The coldest month (with the lowest average low temperature) is July (20.4°C).

Average humidity in December - São Tomé, São Tomé and Príncipe
  • Average humidity in December: 85%

Months with the highest relative humidity are January, November and December (85%).
The month with the lowest relative humidity is July (77%).

Average rainfall in December - São Tomé, São Tomé and Príncipe
  • Average rainfall in December: 108mm

The wettest month (with the highest rainfall) is March (131mm).
The driest month (with the lowest rainfall) is July (0mm).

Average rainfall days in December - São Tomé, São Tomé and Príncipe
  • Average rainfall days in December: 8 days

Months with the highest number of rainy days are March and October (12 days).
The month with the lowest number of rainy days is July (2 days).

Average sea temperature in December - São Tomé, São Tomé and Príncipe
  • Average sea temperature in December: 28°C

Best months for swimming (with the highest average sea temperature) are February, March and April (29°C).
The coldest month (with the lowest average sea temperature) is July (25°C).

Average daylight in December / Average sunshine in December - São Tomé, São Tomé and Príncipe
  • Average daylight in December: 12.1h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).

  • Average sunshine in December: 4.6h

The month with most sunshine is June (Average sunshine: 5.5h).
The month with least sunshine is October (Average sunshine: 3.7h).

Average UV index in December - São Tomé, São Tomé and Príncipe
  • Average UV index in December: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
The month with the lowest UV index is July (UV index 10).