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.

Thursday
11th Dec
30

25

5

7
Friday
12th Dec
28

24

0

4
Saturday
13th Dec
30

25

2

8
Sunday
14th Dec
30

26

5

10
Monday
15th Dec
30

26

6

7

5-day weather forecast updated at 04:02 on Thursday 11th December 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 Thursday 11th December 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 78% chance of some rain and a gentle breeze of 16 kph from the north-east.

30
°C maximum temperature
25
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
7
UV index (High)
78
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
16
kph wind from NE

Koh Samui weather for Friday 12th December 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 28°C, moderate levels of heat & humidity, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 30-40 mm of rainfall expected with 65% chance of some rain and a gentle breeze of 13 kph from the east.

28
°C maximum temperature
24
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
4
UV index (Moderate)
65
% chance of some rain
<40
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from E

Koh Samui weather for Saturday 13th December 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 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 76% chance of some rain and a light breeze of 10 kph from the east.

30
°C maximum temperature
25
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
8
UV index (Very High)
76
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
10
kph wind from E

Koh Samui weather for Sunday 14th December 2025

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 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 71% chance of some rain and a gentle breeze of 13 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
10
UV index (Very High)
71
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from E

Koh Samui weather for Monday 15th December 2025

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 19 kph from the north-east.