Vientiane Climate by Month – Rainy Season, Temperature Averages
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 · 2016–2025
| Monthly averages | High | Low | Rainfall | Rainy season |
|---|---|---|---|---|
| January | 27.4° | 17.8° | 16 mm | 2 |
| February | 29.3° | 19.0° | 16 mm | 2 |
| March | 32.4° | 22.4° | 45 mm | 7 |
| April | 34.2° | 24.6° | 63 mm | 8 |
| May | 32.8° | 25.2° | 221 mm | 22 |
| June | 31.2° | 25.0° | 295 mm | 26 |
| July | 30.6° | 24.7° | 371 mm | 26 |
| August | 30.3° | 24.5° | 435 mm | 27 |
| September | 30.2° | 24.1° | 375 mm | 26 |
| October | 30.1° | 23.1° | 146 mm | 15 |
| November | 29.5° | 21.1° | 31 mm | 4 |
| December | 27.5° | 18.1° | 5 mm | 1 |