The climate in Ko Samui during December can be summarized as hot, humid and wet.
December is in the winter in Ko Samui and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a steamy 29°C (83°F), whilst at night 22°C (72°F) is normal.
|Daytime temperature||28.5°C 83.3°F|
|Nightly temperature||22.3°C 72.1°F|
|Average temperature||25.4°C 77.7°F|
|Daily sunshine||7 hrs|
|Avg rainfall||188 mm 7.4 ins|
|Rainy days||13 days|
|Sea temperature||28.3°C 83°F|
|Windspeed||9.4kph 6 mph|
On average December is the 3rd wettest month of the year in Ko Samui with around 188mm 7.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in December 2019.
|Hottest month:||April||31.6°C 88.9°F|
|Driest month:||February||39mm 1.5ins|
|Coldest month:||January||28.4°C 83.1°F|
|Wettest month:||November||463mm 18.2ins|