Vientiane Weather in September
Laos · 30-year monthly averages
⚠️ Challenging time to visit
September in Vientiane is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (76°F). Expect roughly 265mm of precipitation spread over about 17 rainy days, and heavy rainfall is common — this is peak wet season territory.
Avg high
32°C
89°F
Avg low
25°C
76°F
Rainfall
265mm
very wet
Rainy days
17
days with ≥1mm
☀️ About 158 hours of sunshine over the month (~5h/day).
🎒 What to pack
- breathable summer clothing
- sunscreen, hat and sunglasses
- refillable water bottle
- compact umbrella or rain jacket
September vs the rest of the year
FAQ
- How hot is Vientiane in September?
- September in Vientiane is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (76°F). Expect roughly 265mm of precipitation spread over about 17 rainy days, and heavy rainfall is common — this is peak wet season territory.
- Does it rain a lot in Vientiane in September?
- Vientiane sees around 265mm of precipitation in September on average — very wet by global standards.
- Is September a good time to visit Vientiane?
- September is a challenging month to visit Vientiane weather-wise — plan around the conditions.