Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 31°C. 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 Wednesday 8th October 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 Wednesday 8th October 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 47% chance of some rain and a gentle breeze of 13 kph from the west.

  • 31°C maximum temperature31
    °C maximum temperature
  • 27°C minimum temperature27
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 47% chance of some rain47
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 13 kph from the West13
    kph wind from W

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Koh Samui weather for Thursday 9th October 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 64% chance of some rain and a gentle breeze of 14 kph from the north-west.

  • 31°C maximum temperature31
    °C maximum temperature
  • 27°C minimum temperature27
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 64% chance of some rain64
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 14 kph from the North-West14
    kph wind from NW

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Koh Samui weather for Friday 10th October 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 10-20 mm of rainfall expected with 80% chance of some rain and a light breeze of 12 kph from the west.

  • 31°C maximum temperature31
    °C maximum temperature
  • 27°C minimum temperature27
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 80% chance of some rain80
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 12 kph from the West12
    kph wind from W

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Koh Samui weather for Saturday 11th October 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 10-20 mm of rainfall expected with 67% chance of some rain and a light breeze of 10 kph from the west.

  • 31°C maximum temperature31
    °C maximum temperature
  • 26°C minimum temperature26
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 67% chance of some rain67
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 10 kph from the West10
    kph wind from W

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Koh Samui weather for Sunday 12th October 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 10 (Very High) and 8 hours of bright sunshine. There are 10-20 mm of rainfall expected with 78% chance of some rain and a light breeze of 9 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 27°C minimum temperature27
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 10 (Very High)10
    UV index (Very High)
  • 78% chance of some rain78
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 9 kph from the West9
    kph wind from W

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

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