Climate averages 1991–2020
Vientiane weather
in April.
A hot, moderately wet month: the warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a hot month in Vientiane: daytime highs average 33.8°C and nights cool to about 24.4°C. By daytime temperature it is the warmest month of the year.
Expect about 75 mm of rain on roughly 12 days, which makes April a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 32 min on an average April day.
The nearest other city in this atlas is Udon Thani (64 km away). In April its highs average 34.3°C, about as warm as Vientiane, with 62 mm of rain.
Among the 4 cities listed in Laos, Vientiane ranks joint 2nd of 4 for the warmest April highs and 4th of 4 for the driest April (rainfall, lowest first). The mean April high of those 4 cities is 33.7°C; Vientiane is 0.1°C warmer than that mean.
From April to May, average highs fall by 1.9°C to 31.9°C, and monthly rainfall rises from 75 mm to 261 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Udon Thani in AprilThailand · 64 kmHigh 34.3°C · Low 24.7°C · 62 mm rain
- Khon Kaen in AprilThailand · 171 kmHigh 34.9°C · Low 25.2°C · 65 mm rain
- Sakon Nakhon in AprilThailand · 187 kmHigh 33.7°C · Low 24.5°C · 73 mm rain
- Thakhèk in AprilLaos · 244 kmHigh 33.3°C · Low 23.4°C · 69 mm rain
- Savannakhet in AprilLaos · 277 kmHigh 33.8°C · Low 24.2°C · 66 mm rain
- Lampang in AprilThailand · 330 kmHigh 35.9°C · Low 24.9°C · 47 mm rain
- Vinh in AprilVietnam · 336 kmHigh 29.6°C · Low 22.9°C · 41 mm rain
- Nakhon Ratchasima in AprilThailand · 337 kmHigh 35.0°C · Low 25.0°C · 69 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.