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Climate in Koh Samui (Bangkok Province, 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 Koh 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 Koh Samui, Thailand Copyright © 2023 weather-and-climate.com

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Average water temperature

The mean water temperature over the year. Show in Fahrenheit

Average water temperatures in Koh 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 Inches

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

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Weather Forecasts for Koh Samui (Bangkok Province)

Show in Fahrenheit
Thu   Oct 05
32°C | 25°C
W 14 km/h
5.1 mm
partly cloudy and rain

partly cloudy and rain

hourly forecast
Fri   Oct 06
32°C | 25°C
W 22 km/h
6.9 mm
broken clouds and rain

broken clouds and rain

hourly forecast
Sat   Oct 07
32°C | 25°C
W 14 km/h
11 mm
broken clouds and rain

broken clouds and rain

hourly forecast
5-Day Forecast 10-Day Forecast

The best time of year to visit Koh Samui in Thailand

Other facts from our historical climate data:

  • Which months have the greatest rainfall in Koh Samui?
    Most rainfall (rainy season) is seen in September, October, November and December.
  • Which is the hottest month in Koh Samui?
    May has an average maximum temperature of 31°C (87°F) and is the hottest month of the year.
  • Which is the coolest month in Koh Samui?
    The coolest month is January with an average maximum temperature of 29°C (83°F).
  • Which is the wettest month in Koh Samui?
    October tops the wettest month list with 296mm (11.6in) of rainfall.
  • Which is the driest month in Koh Samui?
    February is the driest month with 44mm (1.7in) of precipitation.
  • Which is the sunniest month in Koh 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.