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.

Friday
23rd Jan
30

25

8

9
Saturday
24th Jan
28

26

8

9
Sunday
25th Jan
30

25

6

10
Monday
26th Jan
30

25

5

10
Tuesday
27th Jan
30

25

7

10

5-day weather forecast updated at 04:02 on Friday 23rd 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 23rd January 2026

Expect sunshine and showers in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a gentle breeze of 16 kph from the east.

30
°C maximum temperature
25
°C minimum temperature
sunshine and showers
8
hours of sunshine
9
UV index (Very High)
34
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
16
kph wind from E

Koh Samui weather for Saturday 24th January 2026

Expect sunshine and showers in Koh Samui, Thailand with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 35% chance of some rain and a light breeze of 12 kph from the east.

28
°C maximum temperature
26
°C minimum temperature
sunshine and showers
8
hours of sunshine
9
UV index (Very High)
35
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
12
kph wind from E

Koh Samui weather for Sunday 25th 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 light breeze of 12 kph from the east.

30
°C maximum temperature
25
°C minimum temperature
broken clouds
6
hours of sunshine
10
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
12
kph wind from E

Koh Samui weather for Monday 26th January 2026

Expect sunshine and showers 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 0-2 mm of rainfall expected with 53% chance of some rain and a gentle breeze of 14 kph from the east.

30
°C maximum temperature
25
°C minimum temperature
sunshine and showers
5
hours of sunshine
10
UV index (Very High)
53
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
14
kph wind from E

Koh Samui weather for Tuesday 27th 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 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.