Koh Samui in January
Dry season begins
By Daan · Last reviewed October 2026
The short answer
January is a good time to visit Koh Samui.
January is dry and sunny after the rains, with the sea calming.
January in detail
What January actually feels like
- Weather
- 24–29°C
- Warm, around 29°C, with some rain early.
- Crowds
- High
- Busy.
- Prices
- $$$$$
- High rates.
+Sunshine after the rains.
–Busy and pricey.
My tip for January
Ang Thong park trips run again by now.
- Beaches
- Snorkeling
How January compares
Against the other eleven months
4th of 12 overall in Koh Samui, 4th for weather, 11th for space, 11th for value. The emptiest month is November; the best value is November.
See all twelve months for Koh SamuiPlan around
What’s on in Koh Samui in January
- High season
- Book holidays early.
December–February
Not set on January?
Even stronger months in Koh Samui
Also good in January
Weather
Weather in Koh Samui in January
In January Koh Samui averages a high of 29°C (84°F) and a low of 24°C (75°F), with about 127 mm of rain or snow over 9 wet days. The warmest month is May (around 33°C) and the coolest is January (around 29°C); the wettest month is November.
- Average high
- 29°C
- 84°F
- Average low
- 24°C
- 75°F
- Precipitation
- 127 mm
- Wet days
- 9
Climate data: World Meteorological Organization (Ko Samui, 1991–2020). Temperatures are averages of daily highs and lows.
Quick answers
Koh Samui in January: the questions people ask
- Is January a good time to visit Koh Samui?
- January is a good time to visit Koh Samui. It ranks 4 of 12 months in Koh Samui overall (4 for weather, 11 for space, 11 for value). The main upside: Sunshine after the rains. The main downside: Busy and pricey.
- What is the weather like in Koh Samui in January?
- Average highs are around 29°C and lows around 24°C. Expect about 127 mm of rain or snow over roughly 9 wet days. Warm, around 29°C, with some rain early. For comparison, the warmest month is May (around 33°C) and the coolest is January (around 29°C).
- Is Koh Samui crowded in January?
- Crowds are high. Busy. The quietest month is November.
- How expensive is Koh Samui in January?
- Prices are at level 5 of 5 ($$$$$). High 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 (January ranks 4 of 12). The quietest month is November and the best value is November.