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. The drastically reduced rainfall of only 6mm 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

December, recording an average high temperature of 31.7°C and a low temperature of 22°C, is Bangkok's coldest month.

Heat index

The heat index in December is computed to be a very hot 38°C. Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. 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 are highly critical for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

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

Rainfall

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

Sea temperature

In Bangkok, the average seawater temperature in December is 27.9°C.
Note: Water temperature ranging from 25°C to 29°C is recognized as warm and pleasant by all, making water activities comfortable and delightful for long durations.

Daylight

With an average of 11h and 18min of daylight, December has the shortest days of the year in Bangkok.
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 06:40 and sunset at 18:00 +07.

Sunshine

In December, the average sunshine in Bangkok is 8.5h.

UV index

With an average maximum UV index of 9, December is the month with the lowest UV index. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 9 suggests this advice:
Skin and eyes are vulnerable without protection. Ensure you always take precautions. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Caution! The mirror effect of sand and water ups the UV radiation strength.