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 35°C with extreme heat and humidity.

Which month has the most rain in Koh Samui?

In terms of rainfall, September is usually the wettest month in Koh Samui with 292mm on average. There are normally 20 days in September with some rain.

When is it sunniest in Koh Samui?

The sunniest time of year in Koh Samui is normally January with bright sunshine on average for 75% of daylight hours; that's 9 hours of sunshine per day.

Best time to visit Koh Samui

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

The best times to visit Koh Samui, Thailand are in February, March and April Daily hours of sunshine = 8 hours or more.

The best times to visit Koh Samui, Thailand are in February, March and April based on our default weather conditions. Update your weather preferences to see which months best match.

Koh Samui by month

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

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When is the best time to visit Koh Samui?

The best times to visit Koh Samui, Thailand are in February, March and April based on the following average weather conditions.

Daily hours of sunshine = 8 hours or more [remove]

Change the criteria to reflect your weather preferences.

4.5
Jan
5
Feb
5
Mar
5
Apr
4
May
4
Jun
4
Jul
4
Aug
4
Sep
4
Oct
4
Nov
4
Dec

Change criteria

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 visit

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

The weather guide for Thailand (Koh 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.

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