Best time to visit Vientiane
Month-by-month weather averages for Vientiane.
Vientiane, Vientiane Prefecture, Laos
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 29.1 °C / 84 °F | 16.9 °C / 62 °F | 15 mm / 0.6 in | good month |
| February | 31.9 °C / 89 °F | 18.9 °C / 66 °F | 15 mm / 0.6 in | good month |
| March | 34.4 °C / 94 °F | 22.2 °C / 72 °F | 29 mm / 1.1 in | neither best nor good |
| April | 35.7 °C / 96 °F | 24.8 °C / 77 °F | 63 mm / 2.5 in | neither best nor good |
| May | 34 °C / 93 °F | 25.6 °C / 78 °F | 218 mm / 8.6 in | neither best nor good |
| June | 33.1 °C / 92 °F | 26 °C / 79 °F | 271 mm / 10.7 in | neither best nor good |
| July | 32.1 °C / 90 °F | 25.8 °C / 78 °F | 370 mm / 14.6 in | neither best nor good |
| August | 31.9 °C / 89 °F | 25.5 °C / 78 °F | 403 mm / 15.9 in | neither best nor good |
| September | 32.1 °C / 90 °F | 25.3 °C / 78 °F | 296 mm / 11.7 in | neither best nor good |
| October | 31.9 °C / 89 °F | 24.1 °C / 75 °F | 115 mm / 4.5 in | neither best nor good |
| November | 31.2 °C / 88 °F | 21.4 °C / 71 °F | 21 mm / 0.8 in | good month |
| December | 29.1 °C / 84 °F | 17.8 °C / 64 °F | 7 mm / 0.3 in | good month |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: good
- FFebruary: good
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: good
- DDecember: good
- Good
- November–February
Vientiane's dry season from November to February gives the driest, sunniest and least oppressive weather for walking tours; from March the heat intensifies and the May-to-October monsoon brings heavy, humid, near-daily rain that makes exploring on foot unrewarding.
Why these months
January · good
In its favour: precipitation 15 mm / 0.6 in, share of daylight that is sunny 91%, wet days 2.2 days, days with heavy rain 0.4 days, average daily low 16.9 °C / 62 °F, relative humidity 70%.
Against: feels like (high) 30.6 °C / 87 °F, average daily high 29.1 °C / 84 °F.
February · good
In its favour: precipitation 15 mm / 0.6 in, share of daylight that is sunny 91%, wet days 1.9 days, days with heavy rain 0.5 days, average daily low 18.9 °C / 66 °F, relative humidity 68%.
Against: feels like (high) 34.1 °C / 93 °F, average daily high 31.9 °C / 89 °F.
November · good
In its favour: precipitation 21 mm / 0.8 in, share of daylight that is sunny 87%, wet days 3.1 days, days with heavy rain 0.5 days, relative humidity 74%, average daily low 21.4 °C / 71 °F.
Against: feels like (high) 35 °C / 95 °F, average daily high 31.2 °C / 88 °F.
Also on: Bun That Luang festival.
December · good
In its favour: precipitation 7 mm / 0.3 in, share of daylight that is sunny 89%, wet days 1.4 days, days with heavy rain 0.1 days, average daily low 17.8 °C / 64 °F, relative humidity 71%.
Against: feels like (high) 31 °C / 88 °F, average daily high 29.1 °C / 84 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Jade Dragon Mountain, 1045 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 30.6 °C | 34.1 °C | 38.1 °C | 41 °C | 40.5 °C | 39.7 °C | 38.6 °C | 38.4 °C | 38.7 °C | 37.4 °C | 35 °C | 31 °C |
| Days with heavy rain | 0.4 days | 0.5 days | 0.7 days | 1.8 days | 8.3 days | 11.2 days | 14.3 days | 15.4 days | 11.6 days | 4.2 days | 0.5 days | 0.1 days |
| Time rain usually falls | 6 am | 7 pm | 5 pm | 5 pm | 8 pm | 9 pm | 4 pm | 4 pm | 11 pm | 11 pm | 12 am | 3 am |
| Sunshine per day | 10.1 h | 10.5 h | 10.8 h | 11.1 h | 9.6 h | 8.7 h | 7.6 h | 7.4 h | 8.3 h | 9.8 h | 9.9 h | 9.8 h |
| Relative humidity | 70% | 68% | 67% | 68% | 78% | 82% | 84% | 85% | 85% | 80% | 74% | 71% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 22.1 µg/m³ | 22.4 µg/m³ | 36.8 µg/m³ | 41.1 µg/m³ | 20.2 µg/m³ | 13.3 µg/m³ | 10.6 µg/m³ | 10.9 µg/m³ | 9.2 µg/m³ | 13.8 µg/m³ | 14.4 µg/m³ | 16 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 30.8 µg/m³ | 31.7 µg/m³ | 54.3 µg/m³ | 61.7 µg/m³ | 31 µg/m³ | 22 µg/m³ | 17.7 µg/m³ | 17.7 µg/m³ | 15.8 µg/m³ | 20.2 µg/m³ | 21.3 µg/m³ | 23.4 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.
Events and seasons
What the weather records cannot show. A major event can lift a month to good or best. The warnings are there to help you plan, and never count against a month.
Reasons to go
- Bun That Luang festival
November, dates vary from year to year