Koh Samui weather in March 2025

Expect 30°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Koh Samui in March based on long-term weather averages. There is usually 5 days with some rainfall and 54 mm of average monthly rainfall in March.

  • 30°C maximum daytime temperature in March in Koh Samui30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 5 days with some rainfall in March in Koh Samui5
    5 days with some rainfall
  • 24°C minimum night-time temperature in March in Koh Samui24
    24°C min night temperature
  • 12 hours of daylight per day in March in Koh Samui12
    12 hours of daylight per day
  • Very high heat & humidity in March in Koh SamuiVH
    Very High heat & humidity
  • 54 mm monthly rainfall in March in Koh Samui54
    54 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in March in Koh Samui11
    11+ (Extreme) UV index
  • 29°C sea temperature in March in Koh Samui29
    29°C sea temperature

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The March weather guide for Thailand (Koh Samui) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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

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How hot is it in Koh Samui in March?

Daytime temperatures usually reach 30°C in Koh Samui in March with very high heat and humidity, falling to 24°C at night.

How sunny is it in Koh Samui in March?

There are normally 8 hours of bright sunshine each day in Koh Samui in March - that's 70% of daylight hours.

How warm is the sea around Koh Samui in March?

The average sea temperature around Koh Samui in March is 29°C.

Does it rain in Koh Samui in March?

There are usually 5 days with some rain in Koh Samui in March and the average monthly rainfall is 54mm.

Koh Samui March sunrise & sunset times

Browse the sunrise and sunset times for Koh Samui in March 2025. Select a month to view Koh Samui sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st March 2025 06:34 18:30
Sunday, 16th March 2025 06:26 18:31
Monday, 31st March 2025 06:18 18:30

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