Vientiane weather in September 2025

Expect daytime maximum temperatures of 32°C in Vientiane, Laos 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 20 days with some rainfall and typically 278 mm of rainfall in the month.

  • 32°C maximum daytime temperature in September in Vientiane32
    32°C max day temperature
  • 5 hours of sunshine per day
  • 20 days with some rainfall in September in Vientiane20
    20 days with some rainfall
  • 24°C minimum night-time temperature in September in Vientiane24
    24°C min night temperature
  • 12 hours of daylight per day in September in Vientiane12
    12 hours of daylight per day
  • Very high heat & humidity in September in VientianeVH
    Very High heat & humidity
  • 278 mm monthly rainfall in September in Vientiane278
    278 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Vientiane11
    11+ (Extreme) UV index

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The September weather guide for Laos (Vientiane) 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 Vientiane in September?

Daytime temperatures usually reach 32°C in Vientiane in September with very high heat and humidity, falling to 24°C at night.

How sunny is it in Vientiane in September?

There are normally 5 hours of bright sunshine each day in Vientiane in September - that's 42% of daylight hours.

Does it rain in Vientiane in September?

There are usually 20 days with some rain in Vientiane in September and the average monthly rainfall is 278mm.

What is the chance of a typhoon in Vientiane in September?

On average 1.2 days in September in Vientiane are likely to be affected by the passage of one or more tropical storms.

Vientiane September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:55 18:24
Monday, 15th September 2025 05:57 18:12
Tuesday, 30th September 2025 06:00 17:59

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