Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 32°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 Sunday 10th August 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 Tuesday 12th August 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 63% chance of some rain and a gentle breeze of 16 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 63% chance of some rain63
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 16 kph from the West16
    kph wind from W

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Koh Samui weather for Wednesday 13th August 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 69% chance of some rain and a gentle breeze of 15 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 69% chance of some rain69
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 15 kph from the West15
    kph wind from W

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Koh Samui weather for Thursday 14th August 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 8 (Very High) and 5 hours of bright sunshine. There are 20-30 mm of rainfall expected with 71% chance of some rain and a gentle breeze of 13 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 71% chance of some rain71
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    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 Friday 15th August 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 77% chance of some rain and a gentle breeze of 13 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C 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
  • 5-10 mm of rainfall expected<10
    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 Saturday 16th August 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 85% chance of some rain and a gentle breeze of 13 kph from the west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 85% chance of some rain85
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    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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  • Pay £0 deposits with direct debit & spread the cost
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Metric (°C / mm)  |  Imperial (°F / inches)

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