Weather in Ko Samui in December 2024
Average weather
Average temperature in Ko Samui in December
The temperature in December is +26°C on average, with a range between a maximum of +27°C during the day and a minimum of +23°C at night.
The average maximum temperature goes up 50% by the end of the month, compared with the beginning of the month, from +25°C to +27°C.
Is Ko Samui warm or cold in December?
Ko Samui is typically warm in December.
Maximum temperatures go up compared to the previous month from +26°C to +26°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.
Take a look at how December is compared to other months in Ko Samui:
Water temperature in Ko Samui in December
Water in Ko Samui in December is Very warm. It varies from +27°C to +30°C, with an average of +28°C. Note that the air temperature is lower than the water temperature, averaging around +26°C.
The water temperature in December is one of the coldest of the entire year:
Can you swim in Ko Samui in December?
Climate in Ko Samui in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +26°C | +26°C | +25°C | ||||
| Min. temperature | ||||||
| +19°C | +20°C | +18°C | ||||
| Max. temperature | ||||||
| +30°C | +30°C | +30°C | ||||
| Rainfall | ||||||
| 278 mm | 115 mm | 47 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +29°C | +28°C | +28°C | ||||
| Humidity | ||||||
| 82% | 79% | 79% | ||||
| Air pressure | ||||||
| 1010 HPa | 1011 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 1 | 2 | 3 | ||||
| Cloudy days | ||||||
| 3 | 10 | 11 | ||||
| Rainy days | ||||||
| 17 | 16 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
December weather is still as ok as in November. The temperature levels stay the same in the area of +26°C for average maximum temperature during the day. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 278 mm to 115 mm. It feels drier, as humidity decreases from 82% to 79%. The average wind speed doesn’t change much during December, staying around 3 m/s. The good news is there are likely to be more sunny days in December, from 1 to 2.
But maybe it is worth considering traveling in January as the weather gets better.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Ko Samui is gradually increasing during December, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last December in Ko Samui?
Climate Change over Years
The climate in Ko Samui in December 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 December a good time to visit Ko Samui?
Can you sunbathe in Ko Samui in December?
Can you swim in Ko Samui in December?
Is Ko Samui rainy in December?
Is it sunny in Ko Samui in December?
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.