December weather forecast
Bintulu, Malaysia

Rounding out the year, December in Bintulu, Malaysia, signifies the height of the rainy season, with an escalated average rainfall of 275mm (10.83"), the year's highest. The city’s weather reaches a soggy climax while temperature and sea temperatures align accurately with the trend of the preceding months. Humidity escalates in response to the enhanced downpours, adding moisture to Bintulu's air. Despite increased rainfall, the duration of sunshine remains quite balanced, giving the city a moderate amount of daylight. December, therefore, showcases the city's weather at its wettest, capping off the climatic cycle of the year.

Temperature

The advent of December in Bintulu denotes an average high-temperature of a warm 29.5°C (85.1°F), subtly different from November's 30.3°C (86.5°F). Nighttime temperatures consistently average 24.2°C (75.6°F) during December.

Heat index

The heat index for December is appraised at a very hot 37°C (98.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. 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', gauges the sensation of temperature factoring in the air's moisture content. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in December is 84%.

Rainfall

The month with the most rainfall in Bintulu is December, when the rain falls for 28.7 days and typically aggregates up to 275mm (10.83") of precipitation.

Sea temperature

In Bintulu, the average seawater temperature in December is 29.3°C (84.7°F).
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

December has the shortest days of the year, with an average of 11h and 54min of daylight.
On the first day of December, sunrise is at 6:18 am and sunset at 6:15 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 6:29 pm +08.

Sunshine

The average sunshine in December is 7.4h.

UV index

The months with the lowest UV index in Bintulu are January and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 6 in December, converts into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be attentive! The UV exposure is heightened with reflections from sand and water.