December weather forecast
Surat Thani, Thailand

Surat Thani in December greets a higher reduction in rainfall from November, offering a relative respite from the wet season. This downward shift in precipitation is accompanied by a mild drop in temperatures, providing a welcome change. Sea temperatures close the year at a comfortable 28°C (82.4°F), still appealing for water activities. Reduced rainfall doesn't necessarily translate to more sun, though, as both daylight and sunshine hours continue to subtly decrease, consistent with the time of year. Finally, the UV index decreases to the lowest point for the year, rounded off at 10.

Temperature

Surat Thani's coldest month, December, registers temperatures that range from a high of 29.9°C (85.8°F) to a low of 22°C (71.6°F).

Heat index

During December, the heat index is computed to be a torrid 39°C (102.2°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In Surat Thani, the average relative humidity in December is 84%.

Rainfall

In December, the rain falls for 13 days. Throughout December, 129mm (5.08") of precipitation is accumulated. In Surat Thani, Thailand, during the entire year, the rain falls for 159 days and collects up to 1622mm (63.86") of precipitation.

Sea temperature

The months with the coldest seawater are January, February and December, with an average sea temperature of 28°C (82.4°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

December has the shortest days of the year, with an average of 11h and 36min of daylight.
On the first day of December, sunrise is at 06:22 and sunset at 18:00. On the last day of the month, sunrise is at 06:37 and sunset at 18:13 +07.

Sunshine

The average sunshine in December in Surat Thani is 6h.

UV index

The month with the lowest UV index in Surat Thani is December, with an average maximum UV index of 10. A UV Index value of 8 to 10 symbolizes a very high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a regular UV index of 10 translates into these guidelines:
Emphasize protection. Neglecting it can lead to swift damage to the skin and eyes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Heed this! UV intensity is much stronger when reflected off sand and water.