Siem Reap weather in September 2026

Expect daytime maximum temperatures of 31°C in Siem Reap, Cambodia in September and very high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with 18 days with some rainfall and typically 250 mm of rainfall in the month.

  • 31°C maximum daytime temperature in September in Siem Reap31
    31°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in September in Siem Reap18
    18 days with some rainfall
  • 24°C minimum night-time temperature in September in Siem Reap24
    24°C min night temperature
  • 12 hours of daylight per day in September in Siem Reap12
    12 hours of daylight per day
  • Very high heat & humidity in September in Siem ReapVH
    Very High heat & humidity
  • 250 mm monthly rainfall in September in Siem Reap250
    250 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Siem Reap11
    11+ (Extreme) UV index

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The September 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 September?

Daytime temperatures usually reach 31°C in Siem Reap in September with very high heat and humidity, falling to 24°C at night.

How sunny is it in Siem Reap in September?

There are normally 5 hours of bright sunshine each day in Siem Reap in September - that's 41% of daylight hours.

Does it rain in Siem Reap in September?

There are usually 19 days with some rain in Siem Reap in September and the average monthly rainfall is 245mm.

Siem Reap September sunrise & sunset times

Browse the sunrise and sunset times for Siem Reap in September 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 September 2026 05:53 18:16
Tuesday, 15th September 2026 05:54 18:06
Wednesday, 30th September 2026 05:54 17:55

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