Vientiane Weather in September
Vientiane in September
The short of it: Vientiane in September averages a high of 32 °C (90 °F) and a low of 24 °C (75 °F), with 258 mm (10.2 in) of rain and about 12 h 13 min of daylight. Rated 2 of 5 for a visit; the best months are December and January. Source: TerraClimate climate normals, 1991–2020.
Average high 32° · low 24° · rain 258 mm · daylight 12 h 13 min
✦✦ Travel with care for a visit · best months: December & January
September in Vientiane brings afternoons near 32° and nights around 24°, with about 258 mm of rain over the month. Days run hot, near 32° in the afternoon; ride early and rest at noon. Wet spells are common — about 258 mm, the 3rd wettest month.
The sun is up for about 12 h 13 min in mid-September, 31 minutes less than a month before.
For the traveller: pack linen, a wide hat and water, and an oilskin besides. The Almanac rates September 2 of 5 for a visit; the finest months here are December and January.
Against its neighbours, Vientiane runs warmer than most and wetter than most in September. Si Chiang Mai, 2 km to the SW, sees much the same highs.
September in Vientiane, by the numbers
- Warmth rank
- 6th warmest of 12
- Rain rank
- 3rd wettest of 12
- Versus August
- about the same, 77 mm less rain
- Versus October
- about the same
- Day–night spread
- 8°
- Snow season
- seldom any
- Daylight, mid-month
- 12 h 13 min
- Average wind
- 3 km/h
Neighbouring Towns
September averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| Si Chiang MaiNong Khai | 2 km SW | 32° | 24° | 250 mm |
| Tha BoNong Khai | 13 km S | 32° | 24° | 230 mm |
| Nong KhaiNong Khai | 18 km ESE | 32° | 24° | 236 mm |
| SangkhomNong Khai | 36 km WNW | 32° | 24° | 214 mm |
| Nam SomUdon Thani | 49 km WSW | 32° | 24° | 196 mm |
| Ban DansavanVientiane | 53 km N | 32° | 24° | 321 mm |
| MaiVientiane | 58 km N | 30° | 23° | 325 mm |
| Kut ChapUdon Thani | 60 km S | 32° | 24° | 205 mm |