Vientiane is rarely comfortable to be outside at midday. It comes closest in late December, and even then it is often wet. For sun, aim for late November to January.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go from late November to January. It peaks in early January, at 73. Avoid May to June for this: it falls to 7, mostly because it is too hot. The clearest skies come in February, when the sky is typically 31% covered at midday (mostly clear).
Vientiane never quite rates Good for being outside. It comes closest in late December, at 45, mostly because it is often wet. The weakest stretch is from mid April to October, when it drops to 0, mostly because it is too hot.
Walking is not what Vientiane is for: the Active outdoors rating tops out at 17, mostly because it is too warm.
The year, measured
The average temperature in Vientiane over the whole year is 27°C. April is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 18°C. The rainy (wet) season in Vientiane runs from February to October, peaking in May with a 85% chance of rain on a given day. The dry season is November to January; December is the driest month, at 50%. Winds in Vientiane are highest in February, averaging 1.6 m/s (6 km/h), and lightest in June, at 1.4 m/s (5 km/h). The prevailing wind is from the SE. The clearest skies in Vientiane come in February, when the sky is typically 32% covered; August is the cloudiest month, at 79%.
Month by month Vientiane climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 27°C | 18°C | 28°C | 57% | 37% | 1.5 m/s | 37 | 67 | 14 |
| February | 28°C | 19°C | 30°C | 78% | 32% | 1.6 m/s | 31 | 55 | 11 |
| March | 31°C | 22°C | 34°C | 78% | 38% | 1.5 m/s | 9 | 32 | 2 |
| April | 33°C | 25°C | 37°C | 82% | 48% | 1.6 m/s | 3 | 16 | 1 |
| May | 33°C | 25°C | 37°C | 85% | 65% | 1.6 m/s | 1 | 10 | 0 |
| June | 31°C | 26°C | 36°C | 81% | 74% | 1.4 m/s | 0 | 10 | 0 |
| July | 31°C | 25°C | 36°C | 82% | 77% | 1.5 m/s | 1 | 15 | 0 |
| August | 30°C | 25°C | 35°C | 81% | 79% | 1.4 m/s | 1 | 17 | 0 |
| September | 30°C | 25°C | 35°C | 81% | 71% | 1.4 m/s | 1 | 16 | 0 |
| October | 31°C | 24°C | 34°C | 79% | 58% | 1.5 m/s | 3 | 28 | 0 |
| November | 30°C | 21°C | 33°C | 64% | 43% | 1.4 m/s | 8 | 51 | 1 |
| December | 27°C | 18°C | 28°C | 50% | 34% | 1.5 m/s | 38 | 61 | 14 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Vientiane weather by season
Year round, Vientiane has days of about 27°C at their warmest in January, its coolest month, and 33°C in April, its warmest; the coolest hours of the day run from 18°C to 26°C through the year, and the average temperature over the year is 27°C around the clock. Rain is most likely around May and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Vientiane weather in winterDecember to February
Winter in Vientiane has typical daily highs of about 27°C and lows of about 18°C, with a 61% chance of rain on a given day.
Vientiane weather in springMarch to May
Spring in Vientiane has typical daily highs of about 32°C and lows of about 24°C, with a 82% chance of rain on a given day.
Vientiane weather in summerJune to August
Summer in Vientiane has typical daily highs of about 31°C and lows of about 25°C, with a 81% chance of rain on a given day.
Vientiane weather in autumnSeptember to November
Autumn in Vientiane has typical daily highs of about 30°C and lows of about 23°C, with a 75% chance of rain on a given day.
When is the rainy season in Vientiane?
The rainy (wet) season in Vientiane runs from February to October, peaking in May with a 85% chance of rain on a given day. The dry season is November to January; December is the driest month, at 50%.
What time of year is Vientiane windiest?
Winds in Vientiane are highest in February, averaging 1.6 m/s (6 km/h), and lightest in June, at 1.4 m/s (5 km/h). The prevailing wind is from the SE.
What is the average temperature in Vientiane year round?
The average temperature in Vientiane over the whole year is 27°C. April is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 18°C.
Where to go instead in late April, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.