Vientiane · AutumnMonth summary
Vientiane weather in September
⚠️ Fair
🌡️ Temperature min / max
75°F – 86°F
🌧 Rainy days
89% of days
☀️ Sunshine
9.9h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
6.9/10
📅 📅 Best month
January (9.1/10)
Quick decision
Should you visit Vientiane in September?
⚠️ Fair
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Not the best window: 89% rain risk and 9.9h of sunshine. January is much safer.
By trip type
Vientiane in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : — No sea access
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
Autumn marks the end of peak season in Vientiane. Temperatures drop (30°F) and rain returns (89% of days). With 89% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. January (9.1/10) is significantly better if possible.
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All months for Vientiane
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 64°F | 82°F | 7% | 0.0in | 10.8h | 9.1/10 |
| ☀️ February | 66°F | 86°F | 7% | 0.0in | 11.0h | 8.6/10 |
| ☀️ March | 73°F | 90°F | 22% | 0.1in | 11.0h | 7.7/10 |
| 🌤️ April | 77°F | 93°F | 28% | 0.1in | 11.4h | 7.2/10 |
| ⛅ May | 77°F | 90°F | 72% | 0.3in | 10.5h | 7.0/10 |
| 🌧️ June | 77°F | 88°F | 87% | 0.4in | 9.1h | 6.1/10 |
| 🌧️ July | 77°F | 88°F | 84% | 0.5in | 8.5h | 6.2/10 |
| 🌧️ August | 75°F | 86°F | 85% | 0.5in | 7.7h | 6.4/10 |
| 🌧️ September | 75°F | 86°F | 89% | 0.5in | 9.9h | 6.9/10 |
| 🌤️ October | 73°F | 86°F | 47% | 0.2in | 10.9h | 7.5/10 |
| ☀️ November | 70°F | 86°F | 12% | 0.0in | 10.5h | 8.3/10 |
| ☀️ December | 64°F | 82°F | 4% | 0.0in | 10.3h | 9.1/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Vientiane averages 86°F, 89% rainy days and 9.9h of sunshine per day. Overall weather score: 6.9/10.
See methodology →
Comparison
September vs January (best month)
The best month is January (score 9.1/10). Difference:
- 🌡️ Max temperature : -2°F
- 🌧 Rainy days : -82%
- ☀️ Sunshine : +0.9h/day
FAQ
FAQ — Vientiane in September
Is September a good time to visit Vientiane?
September is an acceptable time for Vientiane (score 6.9/10). Conditions are decent but not optimal — consider January (9.1/10) if possible.
Does it rain a lot in Vientiane in September?
Yes, 89% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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