December weather forecast
Batam, Indonesia

December weather in Batam, Indonesia showcases the city's tropical climate featuring high humidity, warm temperatures, and considerable rainfall. It continues the pattern observed in November, carrying forward high volumes of precipitation. Displaying a peak in rainfall of 220mm (8.66"), December reinforces Batam's climatic depiction as a tropical paradise. The high levels of precipitation coincide with the booming festive season, adding to Batam's allure as a year-round holiday destination. As December concludes, the transition into the next year maintains a similar weather pattern, continuing the cycle of tropical charm that Batam is known for.

Temperature

November's transformation into December witnesses an average high-temperature of a warm 29.5°C (85.1°F) in Batam, noting a minor change from the preceding month. During the nights of December, Batam records an average low-temperature of 26°C (78.8°F), reflecting a modest decrease from daytime highs.

Heat index

Throughout December, the heat index is evaluated at a torrid 36°C (96.8°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. 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 process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

January and December, with an average relative humidity of 79%, are the most humid months in Batam.

Rainfall

December is the month with the most rainfall. Rain falls for 26.4 days and accumulates 220mm (8.66") of precipitation.

Daylight

The month with the shortest days is December, with an average of 12h and 6min of daylight.
On the first day of December in Batam, Indonesia, sunrise is at 05:50 and sunset at 17:54. On the last day of the month, sunrise is at 06:05 and sunset at 18:08 WIB.

Sunshine

The months with the least sunshine in Batam are January and December, with an average of 7.5h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Batam, Indonesia. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 7 during December translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.