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Vientiane Weather by Month
Average temperatures, rainfall and humidity for Vientiane, Laos, month by month, built from OpenWeather's historical records. Use it to see what a typical Vientiane month looks like before you travel — then check the live Vientiane forecast for the days ahead.
Warmest month
April
36°C average high
Coolest month
January
16°C average low
Wettest month
August
191 mm of rain
Driest month
December
6 mm of rain
Average temperature and rainfall in Vientiane by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 29°C | 16°C | 7°C / 34°C | 12 mm | 70% | 6 km/h |
| February | 31°C | 18°C | 1°C / 38°C | 28 mm | 66% | 7 km/h |
| March | 34°C | 22°C | 13°C / 43°C | 42 mm | 65% | 7 km/h |
| April | 36°C | 24°C | 15°C / 44°C | 57 mm | 65% | 7 km/h |
| May | 34°C | 25°C | 20°C / 42°C | 155 mm | 74% | 6 km/h |
| June | 33°C | 25°C | 21°C / 39°C | 150 mm | 81% | 6 km/h |
| July | 32°C | 24°C | 21°C / 45°C | 150 mm | 83% | 6 km/h |
| August | 32°C | 24°C | 21°C / 36°C | 191 mm | 84% | 6 km/h |
| September | 32°C | 23°C | 20°C / 36°C | 169 mm | 84% | 6 km/h |
| October | 31°C | 22°C | 16°C / 36°C | 66 mm | 79% | 6 km/h |
| November | 31°C | 20°C | 10°C / 36°C | 20 mm | 74% | 6 km/h |
| December | 29°C | 17°C | 8°C / 35°C | 6 mm | 70% | 7 km/h |
Best time to visit Vientiane
The most comfortable time to visit Vientiane is generally November to January, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around August, totalling about 1044 mm a year.
Travellers who prefer heat should aim for April, when highs average 36°C. August is the month to avoid if rain would spoil your plans — it averages 191 mm, roughly 33× the rainfall of December.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Vientiane forecast for what is happening now.