Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 84°F. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.

5-day weather forecast updated at 04:01 on Sunday 30th November 2025 GMT

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The 5-day weather forecast for Thailand (Koh Samui) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Koh Samui weather forecast by day

Below are the detailed weather forecasts for Koh Samui for the next 5 days.

Koh Samui weather for Sunday 30th November 2025

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north.

  • 84°F maximum temperature84
    °F maximum temperature
  • 72°F minimum temperature72
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 6 mph from the North6
    mph wind from N

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Koh Samui weather for Monday 1st December 2025

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 10 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 4 mph from the north-west.

  • 82°F maximum temperature82
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 10 (Very High)10
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 4 mph from the North-West4
    mph wind from NW

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Koh Samui weather for Tuesday 2nd December 2025

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the north-west.

  • 84°F maximum temperature84
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 10 (Very High)10
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 5 mph from the North-West5
    mph wind from NW

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Koh Samui weather for Wednesday 3rd December 2025

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north.

  • 84°F maximum temperature84
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 10 (Very High)10
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 6 mph from the North6
    mph wind from N

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Koh Samui weather for Thursday 4th December 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 53% chance of some rain and a light breeze of 7 mph from the north-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 53% chance of some rain53
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 7 mph from the North-East7
    mph wind from NE

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  • Book online with TUI Black Friday discount code
  • Sign up to myTUI. Discount varies by spend. T&Cs apply
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