Koh Samui weather in January (Bangkok Province, Thailand)

This month is known as a warm month. The average maximum daytime temperature in Koh Samui in January lies at 27.4°C (81.32°F). Usually it is the coldest month of the year. The average minimum temperature goes down to around 24.8°C (76.64°F) (often the minimum temperature is noted at night).

Rainfall during January is high with an average of 118mm (4.6 inchec). There are generally around 9 rainy days. The sun also shows itself regularly this month with 200 hours of sunshine during the entire month.


Koh Samui, monthly averages in January

Show in Celsius
Min Temperature 76 °F  
Max Temperature 81 °F  
Water Temperature 80 °F *  
Chance of Rain 31%  
Precipitation 5 in  
Rainy days 9 days  
Humidity 83% *  
Sunshine 200 hrs *  

Where to stay in Koh Samui


Where to go in Thailand in January

Find out more about the weather in Thailand in January and which places have the best weather conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20-29ºC / 68-84ºF and not too much precipitation (less than 90mm / 3.5inches a month).

So what to wear in January? Visitors traveling to Koh Samui should plan on bringing a totally waterproof coat since it will often be raining. However, also bring your summer cloths because it can be very warm or even hot. With a water temperature of around 27.0°C (80.6°F), this is a great month to swim so bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in January.

Outdoor sports

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in Koh Samui.

Our site offers climate and forecast data for every country in the world. Are you going to Thailand? On this website you can find historical weather averages for many cities in Thailand. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.