December weather forecast
Bangkok, Thailand

Wrapping up the year, December in Bangkok brings forth the coolest conditions tha city experiences. Mercury levels decline to a comfortable range, with temperatures reaching a low of 22°C (71.6°F). The drastically reduced rainfall of only 6mm (0.24") occurring over a single day seals its status as part of the dry season. A lower UV index and milder sea temperatures characterize the beach activities, making it ideal for aquatic sports enthusiasts. Beyond the onset of the New Year, residents and tourists anticipate the ascending temperature trajectories of the forthcoming January.

Temperature

With average temperatures fluctuating between a high of 31.7°C (89.1°F) and a low of 22°C (71.6°F), December stands out as the coldest month.

Heat index

For December, the heat index is appraised at a very hot 38°C (100.4°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', evaluates the perceived heat by adding the effect of moisture in the air. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

With an average relative humidity of 66%, December is the least humid month.

Rainfall

December is the month with the least rainfall. Rain falls for 1 days and accumulates 6mm (0.24") of precipitation.

Sea temperature

In Bangkok, Thailand, the average seawater temperature in December is 27.9°C (82.2°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

December has the shortest days of the year, with an average of 11h and 18min of daylight.
On the first day of the month, sunrise is at 06:25 and sunset at 17:48. On the last day of December, sunrise is at 06:41 and sunset at 18:00 +07.

Sunshine

The average sunshine in December is 8.5h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 9. A UV Index reading of 8 to 10 represents a very high health hazard from exposure to the Sun's UV radiation for the average person.
Note: During December, 9 as the daily maximum UV index converts into the following advice:
Remember to safeguard yourself. Rapid damage can occur to skin and eyes without protection. 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. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Every two hours, apply and reapply an SPF 30+ broad-spectrum sunscreen, especially after swimming or engaging in outdoor activities. Stay aware! UV radiation is magnified when reflecting off sand and water.