Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 84°F. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.

Friday
9th Jan
84

77

3

7
Saturday
10th Jan
86

77

8

9
Sunday
11th Jan
86

77

8

9
Monday
12th Jan
86

77

7

9
Tuesday
13th Jan
88

79

7

9

5-day weather forecast updated at 04:02 on Thursday 8th 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 9th January 2026

Expect mostly cloudy with light rain in Koh Samui, Thailand with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 7 (High) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a moderate breeze of 12 mph from the north-east.

84
°F maximum temperature
77
°F minimum temperature
mostly cloudy with light rain
3
hours of sunshine
7
UV index (High)
44
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
12
mph wind from NE

Koh Samui weather for Saturday 10th January 2026

Expect scattered clouds in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the north-east.

86
°F maximum temperature
77
°F minimum temperature
scattered clouds
8
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
8
mph wind from NE

Koh Samui weather for Sunday 11th January 2026

86
°F maximum temperature
77
°F minimum temperature
scattered clouds
8
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
9
mph wind from NE

Koh Samui weather for Monday 12th January 2026

Expect broken clouds in Koh Samui, Thailand with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the north-east.

86
°F maximum temperature
77
°F minimum temperature
broken clouds
7
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
8
mph wind from NE

Koh Samui weather for Tuesday 13th January 2026

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