Vientiane, Laos Weather
Vientiane hourly forecast: next 24 hours
Today's high of 92°F (33°C) is about 5°F (3°C) above the typical July high of 87°F (31°C).
Current conditions in detail
Vientiane weather tomorrow (Sunday, July 19)
Tomorrow in Vientiane looks partly cloudy, with a high of 90° and an overnight low of 74°. Precipitation chance is modest at 17%. Winds top out near 10 mph, and the UV index reaches 9 (very high).
Vientiane 14-day forecast
About the weather in Vientiane
Vientiane has a tropical wet-and-dry climate, marked by year-round warmth split between a rainy season and a pronounced dry season. Average daytime highs range from about 81°F (27°C) in January to around 94°F (34°C) in April, and the city records roughly 164 days of measurable precipitation a year.
Vientiane weather: quick facts
- Hottest month: April - highs near 94°F (34°C)
- Coldest month: January - highs near 81°F (27°C)
- Record high: 108°F (42°C) · Record low: 49°F (9°C) (2015–2024)
- Wettest month: August (26 rainy days) · Sunniest: April (10.8 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on April. Highs average 94°F (34°C) and overnight lows stay near 76°F (25°C). The coolest month is January, with typical highs of 81°F (27°C) and lows around 64°F (18°C). Based on 2015–2024 weather data, temperatures have reached as high as 108°F (42°C) and dropped as low as 49°F (9°C).
Rain, sun and snow
August is usually the wettest month. It brings about 16.8 inches (428 mm) of rain over 26 days, while December is the driest. April brings the most sunshine, averaging 10.8 hours of sun a day.
Season by season
March through May
March through May in Vientiane is intensely hot, with daytime highs averaging 92°F (33°C) and nights around 76°F (24°C); expect showers on roughly 38 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
June through August
June through August in Vientiane brings hot afternoons, with daytime highs averaging 87°F (31°C) and nights around 77°F (25°C); expect showers on roughly 78 days across the season.
September through November
September through November in Vientiane runs hot, with daytime highs averaging 86°F (30°C) and nights around 73°F (23°C); expect showers on roughly 43 days across the season.
December through February
December through February in Vientiane brings hot afternoons, with daytime highs averaging 82°F (28°C) and nights around 65°F (18°C); precipitation is infrequent.
Average temperatures in Vientiane by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 81° | 64° | 2 | 0.7 in | 10.0 h/day | 66% |
| February | 85° | 66° | 2 | 0.6 in | 10.4 h/day | 64% |
| March | 90° | 73° | 8 | 1.9 in | 10.5 h/day | 66% |
| April | 94° | 76° | 8 | 2.4 in | 10.8 h/day | 64% |
| May | 91° | 78° | 22 | 8.4 in | 9.6 h/day | 76% |
| June | 88° | 77° | 25 | 10.8 in | 8.6 h/day | 83% |
| July | 87° | 77° | 26 | 14.6 in | 7.8 h/day | 85% |
| August | 86° | 76° | 26 | 16.8 in | 7.1 h/day | 86% |
| September | 86° | 76° | 26 | 13.9 in | 8.4 h/day | 86% |
| October | 86° | 74° | 14 | 5.4 in | 9.8 h/day | 79% |
| November | 85° | 71° | 3 | 1.1 in | 10.1 h/day | 70% |
| December | 81° | 65° | 2 | 0.2 in | 9.8 h/day | 65% |