Siem Reap weather in December 2026

Expect daytime maximum temperatures of 30°C in Siem Reap, Cambodia in December and high heat and humidity based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 30°C maximum daytime temperature in December in Siem Reap30
    30°C max day temperature
  • 9 hours of sunshine per day
  • 2 days with some rainfall in December in Siem Reap2
    2 days with some rainfall
  • 20°C minimum night-time temperature in December in Siem Reap20
    20°C min night temperature
  • 11 hours of daylight per day in December in Siem Reap11
    11 hours of daylight per day
  • High heat & humidity in December in Siem ReapH
    High heat & humidity
  • 7 mm monthly rainfall in December in Siem Reap7
    7 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in December in Siem Reap9
    9 (Very High) UV index

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The December weather guide for Cambodia (Siem Reap) 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.

More about Cambodia

How hot is it in Siem Reap in December?

Daytime temperatures usually reach 30°C in Siem Reap in December with high heat and humidity, falling to 22°C at night.

How sunny is it in Siem Reap in December?

There are normally 9 hours of bright sunshine each day in Siem Reap in December - that's 74% of daylight hours.

Does it rain in Siem Reap in December?

There are usually 4 days with some rain in Siem Reap in December and the average monthly rainfall is 27mm.

Siem Reap December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st December 2026 06:11 17:35
Wednesday, 16th December 2026 06:20 17:40
Thursday, 31st December 2026 06:27 17:48

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