Laos weather in September 2025

Expect 90°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Laos in September. Check more long-term weather averages for Laos in September before you book your next holiday to Laos in 2025/2026.

  • 90°F maximum daytime temperature in September in Laos (Vientiane)90
    90°F max day temperature
  • 5 hours of sunshine per day
  • 20 days with some rainfall in September in Laos (Vientiane)20
    20 days with some rainfall
  • 75°F minimum night-time temperature in September in Laos (Vientiane)75
    75°F min night temperature
  • 12 hours of daylight per day in September in Laos (Vientiane)12
    12 hours of daylight per day
  • Very high heat & humidity in September in Laos (Vientiane)VH
    Very High heat & humidity
  • 10.9 inches monthly rainfall in September in Laos (Vientiane)10.9
    10.9 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Laos (Vientiane)11
    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.

Top Laos destinations

Below are average maximum temperatures at popular countries, regions and places in Laos in September. Select a holiday destination to see more weather parameters.

All Laos destinations

Metric (°C)  |  Imperial (°F)

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How hot is it in Laos in September?

Daytime temperatures usually reach 90°F in Vientiane, Laos in September with very high heat and humidity, falling to 75°F at night.

How sunny is it in Laos in September?

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

Does it rain in Laos in September?

There are usually 20 days with some rain in Vientiane, Laos in September and the average monthly rainfall is 10.9 inches.

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

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

Laos September sunrise & sunset times

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

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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