December weather forecast
Phuket, Thailand

December in Phuket presents a full circle, taking steps into the dry season. The considerable reduction in rainfall to 72mm (2.83") inaugurates the onset of tourist season. However, temperatures stabilize, ensuring comfortable conditions for outdoor recreational activities. Sea temperatures are pleasing to swimmers while the extended daylight hours offer ample time for exploration. The holiday spirit in December is augmented by the delightful weather.

Temperature

Phuket, Thailand, measures an average high-temperature of a still hot 31.7°C (89.1°F) in December, identical to the preceding month. In Phuket, the average temperature during the nights of December drops to a warm 24.4°C (75.9°F).

Heat index

Throughout December, the heat index is estimated at a scorching 41°C (105.8°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In Phuket, the average relative humidity in December is 75%.

Rainfall

In Phuket, in December, it is raining for 8 days, with typically 72mm (2.83") of accumulated precipitation. In Phuket, Thailand, during the entire year, the rain falls for 170 days and collects up to 2220mm (87.4") of precipitation.

Sea temperature

January, February and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
Note: Swimming, diving, and other water activities in the temperature range of 25°C (77°F) to 29°C (84.2°F) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

With an average of 11h and 42min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 06:24 and sunset at 18:06. On the last day of the month, sunrise is at 06:39 and sunset at 18:19 +07.

Sunshine

In Phuket, the average sunshine in December is 7.9h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 10. 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: An average UV index of 10 in December transforms into this advice:
Always be cautious. Skin and eyes can be affected swiftly without protection. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. A sunscreen with at least SPF 30 should be used liberally and reapplied frequently on cloudy days, especially after swimming or an outdoor workout. Notice! The reflection of water and sand increases the UV radiation significantly.