Koh Samui weather in January 2027

Expect daytime maximum temperatures of 84°F in Koh Samui, Thailand in January and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall and typically 4.8 inches of rainfall in the month.

  • 84°F maximum daytime temperature in January in Koh Samui84
    84°F max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in January in Koh Samui10
    10 days with some rainfall
  • 72°F minimum night-time temperature in January in Koh Samui72
    72°F min night temperature
  • 12 hours of daylight per day in January in Koh Samui12
    12 hours of daylight per day
  • High heat & humidity in January in Koh SamuiH
    High heat & humidity
  • 4.8 inches monthly rainfall in January in Koh Samui4.8
    4.8 inches of monthly rainfall
  • UV (maximum) index 11 (Extreme) in January in Koh Samui11
    11 (Extreme) UV index
  • 82°F sea temperature in January in Koh Samui82
    82°F sea temperature

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The January weather guide for Thailand (Koh Samui) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Koh Samui in January?

Daytime temperatures usually reach 90°F in Koh Samui in January with high heat and humidity, falling to 70°F at night.

How sunny is it in Koh Samui in January?

There are normally 9 hours of bright sunshine each day in Koh Samui in January - that's 75% of daylight hours.

Does it ever rain in Koh Samui in January?

There is usually 1 day with some rain in Koh Samui in January and the average monthly rainfall is 0.3 inches.

Koh Samui January sunrise & sunset times

Browse the sunrise and sunset times for Koh Samui in January 2027. Select a month to view Koh Samui sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st January 2027 06:36 18:10
Saturday, 16th January 2027 06:40 18:18
Sunday, 31st January 2027 06:42 18:25

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