Vientiane weather in May
May in Vientiane: sweltering, soaked — a fair time to visit.
#8 of 12 months in Vientiane · #548 of 604 destinations to visit in May · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Vientiane climate normals — May
| Daytime high | 34°C / 92°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Feels like (high) | 39°C / 102°F | |
| Rainfall | 173 mm / 6.8 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 22°C / 72°F | |
| Sunshine | 10 h/day | |
| Daylight | 13 h | |
| Wind | 10 km/h / 6 mph | |
| Air quality (US AQI) | 64 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Vientiane in May — FAQ
- Is May a good time to visit Vientiane?
- May in Vientiane: sweltering, soaked — a fair time to visit. It ranks #8 of 12 months for Vientiane on SeasonMap's comfort score (58/100).
- What is the weather like in Vientiane in May?
- In May, Vientiane averages a daily high of 33.6°C and a low of 25.6°C, with about 173.4 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Vientiane in May?
- Vientiane has a mean US Air Quality Index of about 64 in May.