Climate in Ko Samui, Thailand

The graphs below show the monthly weather averages over the year.

Average day and night temperature

The mean minimum and maximum temperatures over the year. Show in Fahrenheit

Average min and max temperatures in Ko Samui, Thailand   Copyright © 2022  weather-and-climate.com

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Monthly hours of sunshine

The average monthly total hours of sunshine over the year

Average monthly sunhours in Ko Samui, Thailand   Copyright © 2022  weather-and-climate.com

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Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc. Show in Inches

Average precipitation (rain/snow) in Ko Samui, Thailand   Copyright © 2022  weather-and-climate.com

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Monthly rainy days

The average number of days each month with rain, snow, hail etc.

Average rainy days (rain/snow) in Ko Samui, Thailand   Copyright © 2022  weather-and-climate.com

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Average humidity

The mean monthly relative humidity over the year

Average relative humidity in Ko Samui, Thailand   Copyright © 2022  weather-and-climate.com

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Weather Forecasts for Ko Samui

SUN Jun 26
29°C | 28°C
Moderate rain

Moderate rain

MON Jun 27
30°C | 28°C
Patchy rain possible

Patchy rain possible

TUE Jun 28
29°C | 28°C
Moderate rain

Moderate rain

The best time of year to visit Ko Samui in Thailand



Other facts from our historical climate data:

  • What is the temperature like year round in Ko Samui?
    It has high temperatures all year round ranging between 29°C (84°F) and 33°C (91°F).
  • When is rainy season in Ko Samui?
    The wet season / rainy season takes place in the following months: May, October, November and December. This is the time of year where the majority of Ko Samui's annual precipitation occurs.
  • Which is the warmest month in Ko Samui?
    May has an average maximum temperature of 33°C (91°F) and is the warmest month of the year.
  • Which is the coldest month in Ko Samui?
    The coldest month is January with an average maximum temperature of 29°C (84°F).
  • Which is the wettest month in Ko Samui?
    November tops the wettest month list with 508mm (20.0in) of rainfall.
  • Which is the driest month in Ko Samui?
    February is the driest month with 52mm (2.0in) of precipitation.
  • Which is the sunniest month in Ko Samui?
    March is the sunniest month with an average of 240 hours of sunshine.

  • No idea where to travel to this year? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.