Usually the weather in Vientiane during the time of May is 27 with usual highs being around 33 and average daily low being 25. We have provided a clearer breakdown here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 27 |
| High Temperature | 33 |
| Low Temperature | 25 |
Useful Links: Vientiane Weather: Average Weather & Yearly Climate