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 Celsius

Average min and max temperatures in Ko Samui, Thailand   Copyright © 2023  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 © 2023  weather-and-climate.com

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Average water temperature

The mean water temperature over the year. Show in Celsius

Average water temperatures in Ko Samui, Thailand   Copyright © 2023  weather-and-climate.com

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Monthly precipitation

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

Average precipitation (rain/snow) in Ko Samui, Thailand   Copyright © 2023  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 © 2023  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 © 2023  weather-and-climate.com

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Weather Forecasts for Ko Samui

Sun   Mar 26
93°F | 77°F
E 7 mph
almost clear and no rain

almost clear and no rain

Mon   Mar 27
91°F | 79°F
E 7 mph
0.04 inches
broken clouds and showers

broken clouds and showers

Tue   Mar 28
91°F | 77°F
SE 11 mph
half cloudy and no rain

half cloudy and no rain

The best time of year to visit Ko Samui in Thailand



Other facts from our historical climate data:

  • Which is the hottest month in Ko Samui?
    May has an average maximum temperature of 30°C (86°F) and is the hottest month of the year.
  • Which is the coolest month in Ko Samui?
    The coolest month is January with an average maximum temperature of 27°C (81°F).
  • Which is the wettest month in Ko Samui?
    November tops the wettest month list with 464mm (18.3in) of rainfall.
  • Which is the driest month in Ko Samui?
    February is the driest month with 30mm (1.2in) 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.