Ko Samui weather

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Usually in February
- 29
- 23
- 9
Weather by month
Now Today
- 31
- 10
5-day forecast

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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.

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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)

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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)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Metric (°C / mm) | Imperial (°F / inches)

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Tropical storm risk: Ko Samui, Thailand typhoon season

% of month affected by tropical storms

1.2%

2.2%

<1%

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

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.

More about tropical storms

Where's hot in Thailand right now?

Below are the temperatures expected today at popular destinations in Thailand. Select a destination to compare today's forecast with average weather conditions.