January weather forecast
Phuket, Thailand

January, like December, is another tropical winter month in Phuket, Thailand, with average temperature ranging between min 24.5°C (76.1°F) and max 32.7°C (90.9°F).
The ideal sea water temperature of 28°C (82.4°F) and only 4 rainfall days, with 30.3mm (1.19") of accumulated rainfall, makes January the best time for swimming and other water activities.

Temperature

In January, the average high-temperature is almost the same as in December - a still tropical 32.7°C (90.9°F). The average low-temperature, in January, is 24.5°C (76.1°F).

Heat index

In January, the average heat index is computed to be an extremely hot 42.5°C (108.5°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. With 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 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, metabolic differences, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in January is 70%.

Rainfall

In January, the rain falls for 4 days. Throughout January, 30.3mm (1.19") of precipitation is accumulated. Throughout the year, in Phuket, there are 170 rainfall days, and 2219.5mm (87.38") of precipitation is accumulated.

Sea temperature

January, February and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
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

Months with the shortest days in Phuket, Thailand, are January and December, with an average of 11.7h of daylight.

Sunshine

The average sunshine in Phuket is 9.2h.

UV index

In Phuket, the average daily maximum UV index is 11. A UV Index value of 11, and more, symbolizes an extreme health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 11 transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.