Koh Samui in October
Rains begin
By Daan · Last reviewed October 2026
The short answer
October is one of the weakest months in Koh Samui.
October is the start of the wet season on Samui, which comes later than on the rest of Thailand.
October in detail
What October actually feels like
- Weather
- 24–31°C
- Around 31°C, rain on 16 days.
- Crowds
- Low
- Quiet.
- Prices
- $$
- Low rates.
+Very quiet.
–Heavy rain starts.
My tip for October
Have indoor plans for the heavy downpours.
- Spas
- Quiet stays
How October compares
Against the other eleven months
11th of 12 overall in Koh Samui, 11th for weather, 2nd for space, 2nd for value. The emptiest month is November; the best value is November.
See all twelve months for Koh SamuiPlan around
What’s on in Koh Samui in October
- Monsoon
- Heavy rain, rough sea. November is the wettest month.
October–December
Not set on October?
Months I'd choose over October
Also good in October
Weather
Weather in Koh Samui in October
In October Koh Samui averages a high of 31°C (88°F) and a low of 24°C (75°F), with about 295 mm of rain or snow over 16 wet days. The warmest month is May (around 33°C) and the coolest is January (around 29°C); the wettest month is November.
- Average high
- 31°C
- 88°F
- Average low
- 24°C
- 75°F
- Precipitation
- 295 mm
- Wet days
- 16
Climate data: World Meteorological Organization (Ko Samui, 1991–2020). Temperatures are averages of daily highs and lows.
Quick answers
Koh Samui in October: the questions people ask
- Is October a good time to visit Koh Samui?
- October is one of the weakest months in Koh Samui. It ranks 11 of 12 months in Koh Samui overall (11 for weather, 2 for space, 2 for value). The main upside: Very quiet. The main downside: Heavy rain starts.
- What is the weather like in Koh Samui in October?
- Average highs are around 31°C and lows around 24°C. Expect about 295 mm of rain or snow over roughly 16 wet days. Around 31°C, rain on 16 days. For comparison, the warmest month is May (around 33°C) and the coolest is January (around 29°C).
- Is Koh Samui crowded in October?
- Crowds are low. Quiet. The quietest month is November.
- How expensive is Koh Samui in October?
- Prices are at level 2 of 5 ($$). Low 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 (October ranks 11 of 12). The quietest month is November and the best value is November.
Still going to Koh Samui in October?
Book early and plan around the busiest hours — heavy rain starts.
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