Best Time to Visit Vientiane
The best time to visit Vientiane is October to March, when the average temperature is 21–28°C and rainfall is low for Vientiane, at 6–85 mm a month.
Vientiane weather by month
The wettest month in Vientiane is August with 246 mm of rain, and the warmest is April at an average 31°C. The coolest is December at 21°C.
| Month | Average temperature | Rainfall | Verdict |
|---|---|---|---|
| January | 21°C / 70°F | 8 mm | Best |
| February | 25°C / 76°F | 13 mm | Best |
| March | 28°C / 83°F | 35 mm | Best |
| April | 31°C / 87°F | 61 mm | Hot |
| May | 29°C / 85°F | 168 mm | Wet |
| June | 28°C / 82°F | 170 mm | Wet |
| July | 27°C / 81°F | 203 mm | Wet |
| August | 27°C / 80°F | 246 mm | Wet |
| September | 27°C / 80°F | 204 mm | Wet |
| October | 25°C / 78°F | 85 mm | Best |
| November | 23°C / 74°F | 16 mm | Best |
| December | 21°C / 69°F | 6 mm | Best |
How we pick the best months
- Best: an average temperature of 15–28°C and low rainfall for Vientiane: under 150 mm, and no more than 91 mm, a quarter above Vientiane's median month (never set below 60 mm).
- If no month qualifies, we show the three driest months that average 10–30°C instead.
- Wet: 150 mm of rain or more. Rainy: more than 91 mm. Hot: 29°C or more on average. Cool: under 15°C. Cold: under 5°C.
Averages cover day and night, so afternoons are warmer than the figure shown. Weather is only one reason to pick a month: school holidays, festivals and prices matter too.
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Where these numbers come from
Monthly averages for January 2001 – December 2020 from the NASA POWER project, for the area around Wattay International (VTE) at 17.98, 102.57. The model covers a grid about 50 km across, so a coastal or hilly spot can run a degree or two different. Retrieved 12 September 2026.
The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project funded through the NASA Earth Science/Applied Science Program.