Koh Samui weather live forecast

Today's maximum temperature in Koh Samui is expected to be 29°C. Select a day from the live weather forecast for Koh Samui, Thailand for more weather parameters.

Wednesday
11th Mar
29

26

4

9
Thursday
12th Mar
30

27

4

11
Friday
13th Mar
30

26

4

11
Saturday
14th Mar
30

26

5

9
Sunday
15th Mar
30

26

5

11

5-day weather forecast updated at 04:01 on Tuesday 10th March 2026 GMT

More about Koh Samui

Koh Samui by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Thailand

TUI: Top deals & discounts on 2026/2027 holidays

Sale

Explore latest special offers & online deals from TUI
Free child places & £0 deposits with direct debit available
Book summer & winter sun holidays in 2026/2027

Go to TUI deal >>

View all TUI offers

TUI deal finder

Destination

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 Wednesday 11th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 29°C, 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 64% chance of some rain and a gentle breeze of 15 kph from the east.

29
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
9
UV index (Very High)
64
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from E

Koh Samui weather for Thursday 12th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, 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 52% chance of some rain and a gentle breeze of 17 kph from the south-east.

30
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
11
UV index (Extreme)
52
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
17
kph wind from SE

Koh Samui weather for Friday 13th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, 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 70% chance of some rain and a moderate breeze of 22 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
11
UV index (Extreme)
70
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
22
kph wind from E

Koh Samui weather for Saturday 14th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 71% chance of some rain and a moderate breeze of 22 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
9
UV index (Very High)
71
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
22
kph wind from E

Koh Samui weather for Sunday 15th March 2026

Expect isolated thunderstorms in Koh Samui, Thailand with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 72% chance of some rain and a moderate breeze of 20 kph from the east.