Climate averages 1991–2020
Vientiane weather
in August.
A hot, very wet month: the joint 7th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Vientiane: daytime highs average 29.6°C and nights cool to about 24.1°C. By daytime temperature it is the joint 7th warmest of the 12 months.
Expect about 401 mm of rain on roughly 27 days, which makes August a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 44 min on an average August day.
The nearest other city in this atlas is Udon Thani (64 km away). In August its highs average 30.1°C, about as warm as Vientiane, with 331 mm of rain.
Among the 4 cities listed in Laos, Vientiane ranks joint 1st of 4 for the warmest August highs and 2nd of 4 for the driest August (rainfall, lowest first). The mean August high of those 4 cities is 29.4°C; Vientiane is 0.2°C warmer than that mean.
From August to September, average highs stay level at 29.6°C, and monthly rainfall falls from 401 mm to 300 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Vientiane climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.3°C17.0°C | 17.0°C | 11 | 1.8 | 11.211 h |
| February | 29.8°C18.9°C | 18.9°C | 15 | 2.2 | 11.512 h |
| March | 32.6°C22.1°C | 22.1°C | 36 | 6.2 | 12.012 h |
| April | 33.8°C24.4°C | 24.4°C | 75 | 11.9 | 12.513 h |
| May | 31.9°C24.7°C | 24.7°C | 261 | 23.4 | 13.013 h |
| June | 30.5°C24.7°C | 24.7°C | 316 | 25.0 | 13.213 h |
| July | 29.9°C24.4°C | 24.4°C | 372 | 26.5 | 13.113 h |
| August, selected | 29.6°C24.1°C | 24.1°C | 401 | 27.4 | 12.713 h |
| September | 29.6°C23.8°C | 23.8°C | 300 | 24.7 | 12.312 h |
| October | 29.3°C22.7°C | 22.7°C | 101 | 11.9 | 11.712 h |
| November | 28.7°C20.2°C | 20.2°C | 22 | 3.0 | 11.311 h |
| December | 26.9°C17.3°C | 17.3°C | 8.4 | 1.2 | 11.111 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Udon Thani in AugustThailand · 64 kmHigh 30.1°C · Low 24.3°C · 331 mm rain
- Khon Kaen in AugustThailand · 171 kmHigh 30.8°C · Low 24.5°C · 214 mm rain
- Sakon Nakhon in AugustThailand · 187 kmHigh 29.9°C · Low 24.3°C · 355 mm rain
- Thakhèk in AugustLaos · 244 kmHigh 29.2°C · Low 23.6°C · 493 mm rain
- Savannakhet in AugustLaos · 277 kmHigh 29.6°C · Low 23.9°C · 294 mm rain
- Lampang in AugustThailand · 330 kmHigh 29.0°C · Low 23.4°C · 272 mm rain
- Vinh in AugustVietnam · 336 kmHigh 31.9°C · Low 26.4°C · 222 mm rain
- Nakhon Ratchasima in AugustThailand · 337 kmHigh 31.3°C · Low 24.5°C · 161 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Vientiane) is explained once on the Vientiane year overview and on the Sources, method and limits page.