Best time to visit Koh Samui

Q: When is the best time to visit Koh Samui?

The best time to visit Koh Samui is February based on the following average weather conditions. Maximum daytime temperature = 22 - 30°C. Daily hours of sunshine = 10 hours or more.

Q: Which is the hottest month in Koh Samui?

The hottest time of year in Koh Samui is normally April. Expect maximum daytime temperatures to reach 32°C with very high heat and humidity.

Q: Which month has the most rain in Koh Samui?

In terms of rainfall, November is usually the wettest month in Koh Samui with 463mm on average. There are normally 19 days in November with some rain.

Q: When is it sunniest in Koh Samui?

The sunniest time of year in Koh Samui is normally February with bright sunshine on average for 72% of daylight hours; that's 9 hours of sunshine per day.

Q: When is the sea warmest in Koh Samui?

The sea is usually at its warmest in Koh Samui in May when the water temperature reaches 30°C.

Find the best time to visit Koh Samui and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Koh Samui by month

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

Recommended for Thailand

Travelbag: Latest holiday sale offers worldwide

Sale

Explore latest sale offers on holidays in 2025/2026
Filter deals by continent, star rating & holiday type
Including Dubai, Caribbean, North America, Asia & Pacific

Go to Travelbag deal >>

View all Travelbag offers

Holiday deal finder

Destination

When is the best time to visit Koh Samui?

The best time to visit Koh Samui is February based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

Change the criteria to reflect your weather preferences.

4
Jan
4
Feb
4
Mar
3
Apr
2
May
2.5
Jun
2.5
Jul
2.5
Aug
2.5
Sep
3
Oct
3.5
Nov
3.5
Dec

Change criteria

Max Day Temperature (°C)

29
Jan
29
Feb
30
Mar
32
Apr
32
May
31
Jun
31
Jul
31
Aug
31
Sep
30
Oct
29
Nov
29
Dec

Hours of Sunshine (daily)

7
Jan
9
Feb
8
Mar
8
Apr
6
May
6
Jun
6
Jul
6
Aug
6
Sep
6
Oct
6
Nov
6
Dec

Which is the hottest month in Koh Samui?

The hottest time of year in Koh Samui is normally April. Expect maximum daytime temperatures to reach 32°C with very high heat and humidity.

Which month has the most rain in Koh Samui?

In terms of rainfall, November is usually the wettest month in Koh Samui with 463mm on average. There are normally 19 days in November with some rain.

When is it sunniest in Koh Samui?

The sunniest time of year in Koh Samui is normally February with bright sunshine on average for 72% of daylight hours; that's 9 hours of sunshine per day.

When is the sea warmest in Koh Samui?

The sea is usually at its warmest in Koh Samui in May when the water temperature reaches 30°C.