Koh Samui in August
Busy summer
By Daan · Last reviewed October 2026
The short answer
August is a reasonable month in Koh Samui — with trade-offs.
August is warm and fairly dry, popular with European families.
August in detail
What August actually feels like
- Weather
- 25–32°C
- Hot, around 32°C, with showers.
- Crowds
- Moderate-High
- Busy.
- Prices
- $$$$
- Higher rates.
+Warm sea and sunshine.
–European holiday crowds.
My tip for August
Chaweng is busiest. Stay in Bophut or Choeng Mon for calm.
- Beaches
- Families
How August compares
Against the other eleven months
7th of 12 overall in Koh Samui, 5th for weather, 9th for space, 9th for value. The emptiest month is November; the best value is November.
See all twelve months for Koh SamuiNot set on August?
Even stronger months in Koh Samui
Also good in August
Weather
Weather in Koh Samui in August
In August Koh Samui averages a high of 32°C (90°F) and a low of 25°C (77°F), with about 102 mm of rain or snow over 11 wet days. The warmest month is May (around 33°C) and the coolest is January (around 29°C); the wettest month is November.
- Average high
- 32°C
- 90°F
- Average low
- 25°C
- 77°F
- Precipitation
- 102 mm
- Wet days
- 11
Climate data: World Meteorological Organization (Ko Samui, 1991–2020). Temperatures are averages of daily highs and lows.
Quick answers
Koh Samui in August: the questions people ask
- Is August a good time to visit Koh Samui?
- August is a reasonable month in Koh Samui — with trade-offs. It ranks 7 of 12 months in Koh Samui overall (5 for weather, 9 for space, 9 for value). The main upside: Warm sea and sunshine. The main downside: European holiday crowds.
- What is the weather like in Koh Samui in August?
- Average highs are around 32°C and lows around 25°C. Expect about 102 mm of rain or snow over roughly 11 wet days. Hot, around 32°C, with showers. For comparison, the warmest month is May (around 33°C) and the coolest is January (around 29°C).
- Is Koh Samui crowded in August?
- Crowds are moderate-high. Busy. The quietest month is November.
- How expensive is Koh Samui in August?
- Prices are at level 4 of 5 ($$$$). Higher rates. The best-value month is November.
- When is the best time to visit Koh Samui?
- In the CrowdFreeViews month scores, February is the best month overall (August ranks 7 of 12). The quietest month is November and the best value is November.