Koh Samui weather in April 2025

Expect daytime maximum temperatures of 32°C in Koh Samui, Thailand in April and very high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 85 mm of rainfall in the month.

  • 32°C maximum daytime temperature in April in Koh Samui32
    32°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in April in Koh Samui8
    8 days with some rainfall
  • 25°C minimum night-time temperature in April in Koh Samui25
    25°C min night temperature
  • 12 hours of daylight per day in April in Koh Samui12
    12 hours of daylight per day
  • Very high heat & humidity in April in Koh SamuiVH
    Very High heat & humidity
  • 85 mm monthly rainfall in April in Koh Samui85
    85 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in April in Koh Samui11
    11+ (Extreme) UV index
  • 30°C sea temperature in April in Koh Samui30
    30°C sea temperature

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The April 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 April?

Daytime temperatures usually reach 32°C in Koh Samui in April with very high heat and humidity, falling to 25°C at night.

How sunny is it in Koh Samui in April?

There are normally 8 hours of bright sunshine each day in Koh Samui in April - that's 64% of daylight hours.

How warm is the sea around Koh Samui in April?

The average sea temperature around Koh Samui in April is 30°C.

Does it rain in Koh Samui in April?

There are usually 8 days with some rain in Koh Samui in April and the average monthly rainfall is 85mm.

Koh Samui April sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st April 2025 06:17 18:30
Tuesday, 15th April 2025 06:10 18:30
Wednesday, 30th April 2025 06:03 18:31

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