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.

Friday
20th Feb
86

81

7

11
Saturday
21st Feb
84

81

7

11
Sunday
22nd Feb
86

79

7

11
Monday
23rd Feb
88

79

8

11
Tuesday
24th Feb
88

79

7

11

5-day weather forecast updated at 04:02 on Friday 20th February 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 20th February 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 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 35% chance of some rain and a moderate breeze of 14 mph from the south-east.

86
°F maximum temperature
81
°F minimum temperature
isolated thunderstorms
7
hours of sunshine
11
UV index (Extreme)
35
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
14
mph wind from SE

Koh Samui weather for Saturday 21st February 2026

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-east.

84
°F maximum temperature
81
°F minimum temperature
scattered clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
M
moderate heat & humidity
9
mph wind from SE

Koh Samui weather for Sunday 22nd February 2026

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.

86
°F maximum temperature
79
°F minimum temperature
scattered clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
M
moderate heat & humidity
7
mph wind from SE

Koh Samui weather for Monday 23rd February 2026

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the south-east.

88
°F maximum temperature
79
°F minimum temperature
scattered clouds
8
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
M
moderate heat & humidity
10
mph wind from SE

Koh Samui weather for Tuesday 24th February 2026

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-east.