Koh Samui weather in June 2025

Expect 31°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Koh Samui in June. Check more long-term weather averages for Koh Samui in June before you book your next holiday to Thailand in 2025/2026.

  • 31°C maximum daytime temperature in June in Koh Samui31
    31°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in June in Koh Samui16
    16 days with some rainfall
  • 24°C minimum night-time temperature in June in Koh Samui24
    24°C min night temperature
  • 13 hours of daylight per day in June in Koh Samui13
    13 hours of daylight per day
  • Very high heat & humidity in June in Koh SamuiVH
    Very High heat & humidity
  • 118 mm monthly rainfall in June in Koh Samui118
    118 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in June in Koh Samui11
    11+ (Extreme) UV index
  • 30°C sea temperature in June in Koh Samui30
    30°C sea temperature

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The June 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 June?

Daytime temperatures usually reach 31°C in Koh Samui in June with very high heat and humidity, falling to 24°C at night.

How sunny is it in Koh Samui in June?

There are normally 6 hours of bright sunshine each day in Koh Samui in June - that's 46% of daylight hours.

How warm is the sea around Koh Samui in June?

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

Does it rain in Koh Samui in June?

There are usually 16 days with some rain in Koh Samui in June and the average monthly rainfall is 118mm.

Koh Samui June sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st June 2025 05:58 18:37
Sunday, 15th June 2025 06:00 18:41
Monday, 30th June 2025 06:03 18:44

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