Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 86°F. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.

Monday
9th Mar
86

81

6

9
Tuesday
10th Mar
84

81

4

9
Wednesday
11th Mar
86

81

4

11
Thursday
12th Mar
86

79

4

11
Friday
13th Mar
86

81

4

9

5-day weather forecast updated at 04:01 on Monday 9th March 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 Monday 9th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 70% chance of some rain and a gentle breeze of 12 mph from the south-east.

86
°F maximum temperature
81
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
70
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
12
mph wind from SE

Koh Samui weather for Tuesday 10th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 90% chance of some rain and a moderate breeze of 12 mph from the east.

84
°F maximum temperature
81
°F minimum temperature
isolated thunderstorms
4
hours of sunshine
9
UV index (Very High)
90
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
12
mph wind from E

Koh Samui weather for Wednesday 11th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 9 mph from the south-east.

86
°F maximum temperature
81
°F minimum temperature
isolated thunderstorms
4
hours of sunshine
11
UV index (Extreme)
67
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
9
mph wind from SE

Koh Samui weather for Thursday 12th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 58% chance of some rain and a gentle breeze of 11 mph from the south-east.

86
°F maximum temperature
79
°F minimum temperature
isolated thunderstorms
4
hours of sunshine
11
UV index (Extreme)
58
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
11
mph wind from SE

Koh Samui weather for Friday 13th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 88% chance of some rain and a moderate breeze of 13 mph from the east.