Koh Samui weather live forecast

Tomorrow's maximum temperature in Koh Samui is expected to be 33°C.

5-day weather forecast updated at 04:01 on Saturday 12th July 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 Saturday 12th July 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 33°C, high levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 57% chance of some rain and a gentle breeze of 15 kph from the west.

  • 33°C maximum temperature33
    °C maximum temperature
  • 27°C minimum temperature27
    °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)
  • 57% chance of some rain57
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    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 Sunday 13th July 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 11 (Extreme) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 13 kph from the south-west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 11 (Extreme)11
    UV index (Extreme)
  • 67% chance of some rain67
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 13 kph from the South-West13
    kph wind from SW

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Koh Samui weather for Monday 14th July 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 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 15 kph from the south-west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 67% chance of some rain67
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 15 kph from the South-West15
    kph wind from SW

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Koh Samui weather for Tuesday 15th July 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 13 kph from the south-west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 67% chance of some rain67
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 13 kph from the South-West13
    kph wind from SW

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Koh Samui weather for Wednesday 16th July 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 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 68% chance of some rain and a light breeze of 11 kph from the south-west.

  • 32°C maximum temperature32
    °C maximum temperature
  • 28°C minimum temperature28
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 68% chance of some rain68
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Light breeze of 11 kph from the South-West11
    kph wind from SW

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  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
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Metric (°C / mm)  |  Imperial (°F / inches)

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