Ko Samui

Find best time to go to Ko Samui for holidays in 2023/2024. Find all your holiday research and inspiration.

Ko Samui by month

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

Thailand weather today

Check out the Thailand weather today and compare with average temperatures and hours of sunshine for September. Explore the 5-day forecast and weather by month (climate guide).

Usually in September
- 31
- 24
- 6
Weather by month
Now Today
- 33
- 4
5-day forecast

Recommended for Thailand

The weather guide for Thailand (Ko Samui) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

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Destination

When is the best time to go to Ko Samui?

The best time to go to Ko 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

Best time to go for the weather

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

Metric (°C / mm) | Imperial (°F / inches)

More about Thailand

Which is the hottest month in Ko Samui?

The hottest time of year in Ko 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 Ko Samui?

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

When is it sunniest in Ko Samui?

The sunniest time of year in Ko 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 Ko Samui?

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

Compare Ko Samui weather with the USA

Below the Ko Samui weather chart shows average maximum daytime temperature for Ko Samui, Thailand and the USA (Washington).

Maximum daytime temperature (°C)

Ko Samui, Thailand

USA (Washington)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec