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

December proves to be the coldest month, recording an average maximum temperature of 31.7°C (89.1°F) and a minimum temperature of 22°C (71.6°F).

Heat index

In December, the heat index is estimated at a fiery hot 38°C (100.4°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. 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.

Rainfall

The month with the least rainfall is December, when the rain falls for 1 days and typically collects 6mm (0.24") of precipitation.

Sea temperature

In Bangkok, in December, the average water temperature is 27.9°C (82.2°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 18min of daylight.
On the first day of December, sunrise is at 06:25 and sunset at 17:48. On the last day of the month, sunrise is at 06:41 and sunset at 18:00 +07.

Sunshine

In Bangkok, 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 vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 9 in December translates into these instructions:
Ensure precautions are always in place. The risk to skin and eyes is high without them. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Despite the cloudy weather, sunscreen with a sun protection factor of at least 30 should be liberally applied and reapplied, including after a swim or outdoor activity. Take note! Sand and water reflections strengthen the Sun's UV exposure.