Phnom Penh weather in September 2025

Expect daytime maximum temperatures of 31°C in Phnom Penh, 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 19 days with some rainfall and typically 245 mm of rainfall in the month.

  • 31°C maximum daytime temperature in September in Phnom Penh31
    31°C max day temperature
  • 5 hours of sunshine per day
  • 19 days with some rainfall in September in Phnom Penh19
    19 days with some rainfall
  • 24°C minimum night-time temperature in September in Phnom Penh24
    24°C min night temperature
  • 12 hours of daylight per day in September in Phnom Penh12
    12 hours of daylight per day
  • Very high heat & humidity in September in Phnom PenhVH
    Very High heat & humidity
  • 245 mm monthly rainfall in September in Phnom Penh245
    245 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Phnom Penh11
    11+ (Extreme) UV index

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The September weather guide for Cambodia (Phnom Penh) 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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More about Cambodia

How hot is it in Phnom Penh in September?

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

How sunny is it in Phnom Penh in September?

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

Does it rain in Phnom Penh in September?

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

Phnom Penh September sunrise & sunset times

Browse the sunrise and sunset times for Phnom Penh in September 2025. Select a month to view Phnom Penh sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:50 18:10
Monday, 15th September 2025 05:50 18:01
Tuesday, 30th September 2025 05:49 17:51

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