Koh Samui in December
Rains ease
By Daan · Last reviewed October 2026
The short answer
December is a below-average month in Koh Samui.
December starts wet but dries out, and the holidays bring big crowds.
December in detail
What December actually feels like
- Weather
- 24–29°C
- Warm, around 29°C, with rain.
- Crowds
- Moderate-High
- Busy around the holidays.
- Prices
- $$$$
- Peak holiday rates.
+Christmas and New Year parties.
–Still rainy early in the month.
My tip for December
Book Christmas and New Year early.
- Christmas
- Nightlife
How December compares
Against the other eleven months
10th of 12 overall in Koh Samui, 10th for weather, 9th for space, 10th 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 December
- Monsoon
- Heavy rain, rough sea. November is the wettest month.
- Ang Thong closure
- The marine park usually closes for part of the monsoon.
- High season
- Book holidays early.
October–December
Around November–December
December–February
Not set on December?
Months I'd choose over December
Also good in December
Weather
Weather in Koh Samui in December
In December Koh Samui averages a high of 29°C (84°F) and a low of 24°C (75°F), with about 263 mm of rain or snow over 12 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
- 29°C
- 84°F
- Average low
- 24°C
- 75°F
- Precipitation
- 263 mm
- Wet days
- 12
Climate data: World Meteorological Organization (Ko Samui, 1991–2020). Temperatures are averages of daily highs and lows.
Quick answers
Koh Samui in December: the questions people ask
- Is December a good time to visit Koh Samui?
- December is a below-average month in Koh Samui. It ranks 10 of 12 months in Koh Samui overall (10 for weather, 9 for space, 10 for value). The main upside: Christmas and New Year parties. The main downside: Still rainy early in the month.
- What is the weather like in Koh Samui in December?
- Average highs are around 29°C and lows around 24°C. Expect about 263 mm of rain or snow over roughly 12 wet days. Warm, around 29°C, with rain. For comparison, the warmest month is May (around 33°C) and the coolest is January (around 29°C).
- Is Koh Samui crowded in December?
- Crowds are moderate-high. Busy around the holidays. The quietest month is November.
- How expensive is Koh Samui in December?
- Prices are at level 4 of 5 ($$$$). Peak holiday 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 (December ranks 10 of 12). The quietest month is November and the best value is November.
Still going to Koh Samui in December?
Book early and plan around the busiest hours — still rainy early in the month.
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