The month in detail
What to expect in September
September falls in the wet season in Vientiane. Showers are often brief but intense. With 57% of rainy days, always have indoor alternatives planned.
September ranks 8 out of 12 months in Vientiane. Compared to August: 11 pts fewer rainy days, +1.3h of sun per day.
This month's conditions
What it's like in September
UV index
6 · high
sunscreen and hat advised
Feels like
oppressive heat
24°
Daylight
12.1h of daylight
Air quality
good
AQI 24
Compare
Is September the right month?
The best month in Vientiane is January (9.1/10), 4.4 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Vientiane
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Vientiane
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Laos
🗣️LanguageLaotien
💶CurrencyKip laotien (₭)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘVery cheap · 1/5
🌡️ Climate
🌍Climate typeTropical
📈Climate trend ⓘStable
🔥Hottest monthApril · 34°C
❄️Coolest monthJanuary · 28°C
🌧️Rainiest month ⓘAugust · 68%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Vientiane ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
LaosTropical climate with a 9.1 → 4.5 gap between best and worst month. 10 years of ERA5 data to choose by project.
17.97°N · 102.60°E
Questions
Frequently asked questions
What is the best time to visit Vientiane?
December is the best month with 28.0°C highs, 18.0°C lows, 7.3h of sunshine and 3.0% rainy days. The months of December & January offer comparable conditions.
How many hours of sunshine does Vientiane get in December?
Vientiane averages 7.3 sunshine hours per day in December. It is the sunniest month with a climate score of 8.8/10.
What is the rainiest month in Vientiane?
July is the most unfavourable month with July has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Vientiane in December?
In December, overnight lows reach 18.0°C, while afternoon highs average 28.0°C.
Is Vientiane good in winter?
In winter (December-February), Vientiane scores 7.8/10 on average — Decent period conditions for cultural visits.. The best month overall remains December with a score of 8.8/10.
When should you avoid Vientiane?
July is the most difficult month to visit Vientiane, with July has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in Vientiane in September?
The average UV index reaches 6 in September in Vientiane (high), with about 12.1h of daylight. Sunscreen and hat advised.