Koh Samui weather in December 2026

Expect daytime maximum temperatures of 84°F in Koh Samui, Thailand in December and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 7.4 inches of rainfall in the month.

  • 84°F maximum daytime temperature in December in Koh Samui84
    84°F max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in December in Koh Samui13
    13 days with some rainfall
  • 72°F minimum night-time temperature in December in Koh Samui72
    72°F min night temperature
  • 12 hours of daylight per day in December in Koh Samui12
    12 hours of daylight per day
  • High heat & humidity in December in Koh SamuiH
    High heat & humidity
  • 7.4 inches monthly rainfall in December in Koh Samui7.4
    7.4 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in December in Koh Samui10
    10 (Very High) UV index
  • 82°F sea temperature in December in Koh Samui82
    82°F sea temperature

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The December 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 December?

Daytime temperatures usually reach 88°F in Koh Samui in December with high heat and humidity, falling to 70°F at night.

How sunny is it in Koh Samui in December?

There are normally 8 hours of bright sunshine each day in Koh Samui in December - that's 73% of daylight hours.

Does it ever rain in Koh Samui in December?

There is usually 1 day with some rain in Koh Samui in December and the average monthly rainfall is 0.4 inches.

Koh Samui December sunrise & sunset times

Browse the sunrise and sunset times for Koh Samui in December 2026. Select a month to view Koh Samui sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st December 2026 06:20 17:57
Wednesday, 16th December 2026 06:28 18:02
Thursday, 31st December 2026 06:35 18:10

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