Weather in Ko Samui in January 2025
- January is usually the coldest month of the year in Ko Samui;
Average weather
Average temperature in Ko Samui in January
The temperature in January is +26°C on average, with a range between a maximum of +30°C during the day and a minimum of +18°C at night.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +26°C to +26°C.
Is Ko Samui warm or cold in January?
Ko Samui is typically warm in January.
Maximum temperatures go down compared to the previous month from +26°C to +25°C. The minimum temperature also goes up from +24°C to +24°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
January is the coldest month in Ko Samui, here is the comparison with other months:
Water temperature in Ko Samui in January
Water in Ko Samui in January is Warm. It varies from +27°C to +29°C, with an average of +28°C. Note that the air temperature is lower than the water temperature, averaging around +25°C.
The water temperature in January is one of the coldest of the entire year:
Can you swim in Ko Samui in January?
Climate in Ko Samui in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +26°C | +25°C | +26°C | ||||
| Min. temperature | ||||||
| +20°C | +18°C | +17°C | ||||
| Max. temperature | ||||||
| +30°C | +30°C | +32°C | ||||
| Rainfall | ||||||
| 115 mm | 47 mm | 29 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +28°C | +28°C | +28°C | ||||
| Humidity | ||||||
| 79% | 79% | 78% | ||||
| Air pressure | ||||||
| 1011 HPa | 1011 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 2 | 3 | 5 | ||||
| Cloudy days | ||||||
| 10 | 11 | 11 | ||||
| Rainy days | ||||||
| 16 | 16 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
January often has better weather than December. It’s getting colder in January. From +26°C in the day, the average maximum temperature lowers to +25°C. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 115 mm to 47 mm. Humidity levels don’t change as the month goes on, averaging around 79%. The average wind speed doesn’t change much during January, staying around 3 m/s. The good news is there are likely to be more sunny days in January, from 2 to 3.
February brings much the same weather, it remains good.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ko Samui is gradually decreasing during January, going from 4 m/s to 2 m/s over the course of the month.
Rain
How was the weather last January in Ko Samui?
Climate Change over Years
The climate in Ko Samui in January has not changed much over the last 43 years.
The average temperature was the lowest in 1986 (+26°C) and the highest in 2012 (+28°C). The driest year was 1997 with only 927 mm of rainfall, and the wettest year was 1999 with 1981 mm.
FAQ
Is January a good time to visit Ko Samui?
Can you sunbathe in Ko Samui in January?
Can you swim in Ko Samui in January?
Is Ko Samui rainy in January?
Is it sunny in Ko Samui in January?
Other cities in Thailand
Monthly weather in Ko Samui
Source of the data
For this page, we’ve looked at the typical weather in Ko Samui, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.