January weather forecast and climate
Ko Samui, Thailand

The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around
The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around
January, like December, in Ko Samui, Thailand, is another warm winter month, with average temperature ranging between min. 24.2°C (75.6°F) and max. 29°C (84.2°F).

Temperature

The coldest month in Ko Samui is January, with an average high-temperature of 29°C (84.2°F) and an average low-temperature of 24.2°C (75.6°F).

Humidity

The average relative humidity in Ko Samui, Thailand, is 83%.

Rainfall

In Ko Samui, during January, the rain falls for 11 days and regularly aggregates up to 86.2mm (3.4") of precipitation. In Ko Samui, during the entire year, the rain falls for 160 days and collects up to 1960.1mm (77.2") of precipitation.

Sea temperature

The month with the coldest seawater is January, with an average sea temperature of 27.8°C (82°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.

Daylight

Months with the shortest days in Ko Samui are January and December, with an average of 11.6h of daylight.

Sunshine

In Ko Samui, the average sunshine in January is 7h.

UV index

In Ko Samui, the average daily maximum UV index in January is 11. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to the UV radiation for average individuals.
The daily maximum UV index of 11 in January interpret into the following advice:
Practice all-important precautions. Light skin people may get burned in less than 5 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. 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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the coldest month in Ko Samui?

With an average high-temperature of 29°C (84.2°F) and an average low-temperature of 24.2°C (75.6°F), January is the coldest month.

What is the temperature in January in Ko Samui?

The average high-temperature, in January, in Ko Samui, Thailand, is 29°C (84.2°F), while the average low-temperature is 24.2°C (75.6°F).

What is the average humidity in January in Ko Samui?

In January, the average relative humidity in Ko Samui is 83%.

How many days does it rain in January in Ko Samui?

In Ko Samui, Thailand, in January, it is raining for 11 days, with typically 86.2mm (3.4") of accumulated precipitation.

When is the sea coldest in Ko Samui?

The month with the coldest seawater in Ko Samui, Thailand, is January, with an average sea temperature of 27.8°C (82°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.

How warm is the water in January in Ko Samui?

In Ko Samui, Thailand, in January, the average water temperature is 27.8°C (82°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the month with the shortest days in Ko Samui?

January and December, with an average of 11.6h of daylight, are months with the shortest days.

What is the average length of the day in January in Ko Samui?

In Ko Samui, Thailand, the average length of the day in January is 11.6h.

How many hours of sunshine does Ko Samui have in January?

The average sunshine in January in Ko Samui is 7h.

What is the UV index reading in January in Ko Samui?

In January, the average daily maximum UV index in Ko Samui, Thailand, is 11. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation.
Average temperature in January - Ko Samui, Thailand
  • Average high temperature in January: 29°C

The warmest month (with the highest average high temperature) is April (32.6°C).
The month with the lowest average high temperature is January (29°C).

  • Average low temperature in January: 24.2°C

The month with the highest average low temperature is April (26.1°C).
The coldest month (with the lowest average low temperature) is December (23.9°C).

Average humidity in January - Ko Samui, Thailand
  • Average humidity in January: 83%

Months with the highest relative humidity are October and November (85%).
Months with the lowest relative humidity are June, July and August (78%).

Average rainfall in January - Ko Samui, Thailand
  • Average rainfall in January: 86.2mm

The wettest month (with the highest rainfall) is November (506.6mm).
The driest month (with the lowest rainfall) is February (54.4mm).

Average rainfall days in January - Ko Samui, Thailand
  • Average rainfall days in January: 11 days

Months with the highest number of rainy days are October and November (20 days).
The month with the lowest number of rainy days is March (4 days).

Average sea temperature in January - Ko Samui, Thailand
  • Average sea temperature in January: 27.8°C

The best month for swimming (with the highest average sea temperature) is May (30.1°C).
The coldest month (with the lowest average sea temperature) is January (27.8°C).

Average daylight in January / Average sunshine in January - Ko Samui, Thailand
  • Average daylight in January: 11.6h

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in January: 7h

The month with most sunshine is February (Average sunshine: 9h).
Months with least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6).

Average UV index in January - Ko Samui, Thailand
  • Average UV index in January: 11

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

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