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Koh Samui weather live forecast
Today's maximum temperature in Koh Samui is expected to be 30°C. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.
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Wednesday
22nd Oct -
Thursday
23rd Oct -
Friday
24th Oct -
Saturday
25th Oct -
Sunday
26th Oct
5-day weather forecast updated at 04:01 on Wednesday 22nd 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 22nd October 2025
Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, 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 78% chance of some rain and a gentle breeze of 13 kph from the north-west.
- °C maximum temperature
- °C minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (Very High)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph wind from NW
Koh Samui weather for Thursday 23rd 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 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 60% chance of some rain and a gentle breeze of 16 kph from the north-east.
- °C maximum temperature
- °C minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph wind from NE
Koh Samui weather for Friday 24th 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 3 hours of bright sunshine. There are 40-50 mm of rainfall expected with 85% chance of some rain and a light breeze of 11 kph from the north-east.
- °C maximum temperature
- °C minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- moderate heat & humidity
- kph wind from NE
Koh Samui weather for Saturday 25th October 2025
Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 50 mm or more of rainfall expected with 98% chance of some rain and a light breeze of 9 kph from the north-east.
- °C maximum temperature
- °C minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (Moderate)
- % chance of some rain
- mm or more of rainfall expected
- moderate heat & humidity
- kph wind from NE
Koh Samui weather for Sunday 26th October 2025
Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 50 mm or more of rainfall expected with 94% chance of some rain and a light breeze of 8 kph from the east.
- °C maximum temperature
- °C minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm or more of rainfall expected
- moderate heat & humidity
- kph wind from E
- Book online with TUI & save up to 8% on holidays
- FREE child places available for select holidays
- Pay £0 deposits with direct debit & spread the cost
Metric (°C / mm) | Imperial (°F / inches)
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