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 23rd 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 23rd November 2025

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 7 (High) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 15 mph from the north-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Moderate breeze of 15 mph from the North-East15
    mph wind from NE

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Koh Samui weather for Monday 24th November 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 30-40 mm of rainfall expected with 79% chance of some rain and a moderate breeze of 14 mph from the north-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 79% chance of some rain79
    % chance of some rain
  • 30-40 mm of rainfall expected<40
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Moderate breeze of 14 mph from the North-East14
    mph wind from NE

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Koh Samui weather for Tuesday 25th November 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 40-50 mm of rainfall expected with 77% chance of some rain and a moderate breeze of 13 mph from the north-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 77% chance of some rain77
    % chance of some rain
  • 40-50 mm of rainfall expected<50
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Moderate breeze of 13 mph from the North-East13
    mph wind from NE

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Koh Samui weather for Wednesday 26th November 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 65% chance of some rain and a gentle breeze of 12 mph from the north-east.

  • 86°F maximum temperature86
    °F maximum temperature
  • 79°F minimum temperature79
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 65% chance of some rain65
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 12 mph from the North-East12
    mph wind from NE

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Koh Samui weather for Thursday 27th November 2025

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 13 mph from the north-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 81°F minimum temperature81
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    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
  • Moderate breeze of 13 mph from the North-East13
    mph wind from NE

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  • Save up to £300 on holidays (Jan 2026-Nov 2027)
  • Book online with TUI Black Friday discount code
  • Sign up to myTUI. Discount varies by spend. T&Cs apply
Go to TUI deal >>

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