Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 29°C. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.

Friday
30th Jan
29

26

5

10
Saturday
31st Jan
30

26

6

10
Sunday
1st Feb
30

26

6

9
Monday
2nd Feb
30

26

6

9
Tuesday
3rd Feb
30

26

6

10

5-day weather forecast updated at 04:01 on Thursday 29th January 2026 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 Friday 30th January 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 15 kph from the south-east.

29
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
10
UV index (Very High)
25
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from SE

Koh Samui weather for Saturday 31st January 2026

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south-east.

30
°C maximum temperature
26
°C minimum temperature
broken clouds
6
hours of sunshine
10
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from SE

Koh Samui weather for Sunday 1st February 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 60% chance of some rain and a gentle breeze of 15 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
60
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from E

Koh Samui weather for Monday 2nd February 2026

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
broken clouds
6
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
18
kph wind from E

Koh Samui weather for Tuesday 3rd February 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 58% chance of some rain and a gentle breeze of 19 kph from the east.