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

Temperature records mark December as the coldest month, with highs averaging 31.7°C (89.1°F) and lows at 22°C (71.6°F).

Heat index

The average heat index in December is calculated to be a sweltering 38°C (100.4°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

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, the average seawater temperature in December is 27.9°C (82.2°F).
Note: Between 25°C (77°F) and 29°C (84.2°F), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

The month with the shortest days is December, 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, in Bangkok, Thailand, sunrise is at 06:41 and sunset at 18:00 +07.

Sunshine

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

UV index

The month with the lowest UV index is December, 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 average individuals.
Note: In December, the maximum UV index of 9 translates into these guidelines:
Without constant care, eyes and skin might suffer damage in a short time. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.