Vientiane Weather in September – Average Temperature and Rainfall
- High
- 30.2°
- Low
- 24.1°
- Rainfall
- 375 mm
- Rainy season
- 26d
- max
- 34.4°
- min
- 21.4°
September
- Early
- 30.4° 124.0 mm
- Mid
- 30.2° 140.2 mm
- Late
- 29.9° 110.7 mm
Summary
The climate figures for Vientiane are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 2,018 mm.
The rainy season runs May–October. The wettest month is August with 434.9 mm across 27 rain days; the driest is December at just 5.3 mm.
The hottest month is April (average high 34.2°C) and the coolest is January (27.4°C).
The most comfortable time to visit Vientiane is December — less rain and milder heat.
Monthly averages
Common questions
Will it rain in Vientiane today?
No. The chance of rain today is only about 29%.
How hot is it in Vientiane today?
Between 25°C and 32°C, with a felt maximum of 38°C.
What is the weather in Vientiane tomorrow?
Tomorrow: thunderstorm, 23–32°C, with a 67% chance of rain.