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Ko Samui weather
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The weather guide for Ko Samui, Thailand shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.
Which is the hottest month in Ko Samui?
The hottest time of year in Ko Samui is normally April. Expect maximum daytime temperatures to reach 32°C with very high heat and humidity.
Which month has the most rain in Ko Samui?
In terms of rainfall, November is usually the wettest month in Ko Samui with 463mm on average. There are normally 19 days in November with some rain.
When is it sunniest in Ko Samui?
The sunniest time of year in Ko Samui is normally February with bright sunshine on average for 72% of daylight hours; that's 9 hours of sunshine per day.
When is the sea warmest in Ko Samui?
The sea is usually at its warmest in Ko Samui in May when the water temperature reaches 30°C.
Metric (°C / mm) | Imperial (°F / inches)
Compare Ko Samui weather with the USA
Below the Ko Samui weather chart shows average maximum daytime temperature for Ko Samui, Thailand and the USA (Washington).
Maximum daytime temperature (°C)
Ko Samui, Thailand
USA (Washington)
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Metric (°C / mm) | Imperial (°F / inches)
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Tropical storm risk: Ko Samui, Thailand typhoon season
% of month affected by tropical storms
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The Ko Samui, Thailand tropical storm risk chart above shows the typhoon season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.
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