Ko Samui weather in January 2025

Expect 29°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Ko Samui in January. Check more long-term weather averages for Ko Samui in January before you book your next holiday to Thailand in 2025/2026.

  • 29°C maximum daytime temperature in January in Ko Samui29
    29°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in January in Ko Samui10
    10 days with some rainfall
  • 22°C minimum night-time temperature in January in Ko Samui22
    22°C min night temperature
  • 12 hours of daylight per day in January in Ko Samui12
    12 hours of daylight per day
  • High heat & humidity in January in Ko SamuiH
    High heat & humidity
  • 123 mm monthly rainfall in January in Ko Samui123
    123 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in January in Ko Samui11
    11 (Extreme) UV index
  • 28°C sea temperature in January in Ko Samui28
    28°C sea temperature

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The January weather guide for Thailand (Ko 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Ko Samui in January?

Daytime temperatures usually reach 29°C in Ko Samui in January with high heat and humidity, falling to 22°C at night.

How sunny is it in Ko Samui in January?

There are normally 7 hours of bright sunshine each day in Ko Samui in January - that's 64% of daylight hours.

How warm is the sea around Ko Samui in January?

The average sea temperature around Ko Samui in January is 28°C.

Does it rain in Ko Samui in January?

There are usually 10 days with some rain in Ko Samui in January and the average monthly rainfall is 123mm.

Ko Samui January sunrise & sunset times

Browse the sunrise and sunset times for Ko Samui in January 2025. Select a month to view Ko Samui sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st January 2025 06:36 18:11
Thursday, 16th January 2025 06:41 18:18
Friday, 31st January 2025 06:42 18:25

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