December weather forecast and climate
Bangkok, Thailand

A beautiful park outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand
A beautiful park outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand
The first month of the winter, December, is still a hot month in Bangkok, Thailand, with average temperature varying between 22°C (71.6°F) and 31.7°C (89.1°F).
An excellent water temperature of 27.9°C (82.2°F) and only 1 rainfall days, with 6.3mm (0.25") of accumulated rainfall, makes December a prime for swimming and other water activities.

Temperature

December is the coldest month in Bangkok, with an average high-temperature of 31.7°C (89.1°F) and an average low-temperature of 22°C (71.6°F).

Heat index

In December, the average heat index is appraised at a sweltering 38.2°C (100.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, metabolic differences, wind, and pregnancy affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The least humid month is December, with an average relative humidity of 66%.

Rainfall

The month with the least rainfall is December when the rain falls for 1 days and typically collects 6.3mm (0.25") of precipitation.

Sea temperature

In Bangkok, the average seawater temperature is 27.9°C (82.2°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The month with the shortest days in Bangkok, Thailand, is December, with an average of 11.3h of daylight.

Sunshine

In Bangkok, Thailand, the average sunshine 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 of 8 to 10 symbolizes a very high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 9 transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the coldest month in Bangkok?

December is the coldest month in Bangkok, with an average high-temperature of 31.7°C (89.1°F) and an average low-temperature of 22°C (71.6°F).

What is the temperature in December in Bangkok?

In December, in Bangkok, the average high-temperature is 31.7°C (89.1°F), and the average low-temperature is 22°C (71.6°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines both air temperature and relative humidity, in December is appraised at 38.2°C (100.8°F).

What is the least humid month in Bangkok?

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

What is the average humidity in December in Bangkok?

In December, the average relative humidity in Bangkok, Thailand, is 66%.

How many days does it rain in December in Bangkok?

In Bangkok, Thailand, in December, it is raining for 1 days, with typically 6.3mm (0.25") of accumulated precipitation.

What is the driest month in Bangkok?

December is the month with the least rainfall in Bangkok, Thailand. Rain falls for 1 days and accumulates 6.3mm (0.25") of precipitation.

How warm is the water in December in Bangkok?

In Bangkok, in December, the average water temperature is 27.9°C (82.2°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Bangkok?

With an average of 11.3h of daylight, December has the shortest days of the year in Bangkok.

What is the average length of the day in December in Bangkok?

In December, the average length of the day in Bangkok, Thailand, is 11.3h.

How long on average sun shines in December in Bangkok?

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

What is the month with the lowest UV index in Bangkok?

With an average maximum UV index of 9, December is the month with the lowest UV index.

What is the UV index intensity in December in Bangkok?

In December, the average daily maximum UV index is 9. A UV Index estimate of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in December - Bangkok, Thailand
  • Average high temperature in December: 31.7°C

The warmest month (with the highest average high temperature) is April (35.4°C).
The month with the lowest average high temperature is December (31.7°C).

  • Average low temperature in December: 22°C

The month with the highest average low temperature is April (26.9°C).
The coldest month (with the lowest average low temperature) is December (22°C).

Average humidity in December - Bangkok, Thailand
  • Average humidity in December: 66%

The month with the highest relative humidity is September (79%).
The month with the lowest relative humidity is December (66%).

Average rainfall in December - Bangkok, Thailand
  • Average rainfall in December: 6.3mm

The wettest month (with the highest rainfall) is September (334.3mm).
The driest month (with the least rainfall) is December (6.3mm).

Average rainfall days in December - Bangkok, Thailand
  • Average rainfall days in December: 1 days

The month with the highest number of rainy days is September (21 days).
Months with the least rainy days are January and December (1 days).

Average sea temperature in December - Bangkok, Thailand
  • Average sea temperature in December: 27.9°C

The best month for swimming (with the highest average sea temperature) is May (29.9°C).
The coldest month (with the lowest average sea temperature) is January (26.7°C).

Average daylight in December / Average sunshine in December - Bangkok, Thailand
  • Average daylight in December: 11.3h

The month with the longest days is June (Average daylight: 12.9h).
The month with the shortest days is December (Average daylight: 11.3h).

  • Average sunshine in December: 8.5h

The month with the most sunshine is February (Average sunshine: 9h).
Months with the least sunshine are August and September (Average sunshine: 5.2).

Average UV index in December - Bangkok, Thailand
  • Average UV index in December: 9

Months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).