Vientiane, Laos Weather
Vientiane hourly forecast: next 24 hours
Today's high of 86°F (30°C) is right in line with the typical August high of 86°F (30°C).
Current conditions in detail
Vientiane weather tomorrow (Friday, August 28)
Tomorrow in Vientiane looks patchy rain nearby, with a high of 86° and an overnight low of 75°. There is a 74% chance of rain - plan accordingly. Winds top out near 8 mph, and the UV index reaches 11 (very high).
Vientiane 14-day forecast
About the weather in Vientiane
Vientiane's year is organised around rain rather than temperature. 59% of its 76.7 inches (1948 mm) annual total arrives in the July to September window, while December averages 5 mm (0.2 in). Temperatures move far less: 94°F (34°C) at the year's warmest against 81°F (27°C) at its coolest.
Vientiane weather: quick facts
- Hottest month: April - highs near 94°F (34°C)
- Coldest month: January - highs near 81°F (27°C)
- Decade extremes (2015-2024): 108°F (42°C) high · 49°F (9°C) low
- Wettest month: August (26 rainy days) · Sunniest: April (10.8 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 7°C between the average warmest and coolest month · day to night: 8°C
- Months averaging 30°C or hotter: 7
- Average humidity: 74%
Temperatures through the year
January sits at the other end of the year: 81°F (27°C) by day, 64°F (18°C) at night. At its warmest, in April, Vientiane runs to 94°F (34°C) in the afternoon and back to 76°F (25°C) by dawn. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 108°F (42°C) and the lowest daily minimum 49°F (9°C). Average highs hold at or above 30°C for 7 months of the year, March through September being the unbroken run.
Rain, sun and snow
Rainfall is strongly seasonal: 59% of the annual total falls in the July to September window, leaving December at 5 mm (0.2 in). 3 months average under 20 mm of rain, the longest unbroken stretch running December through February.
Season by season
March through May
March through May in Vientiane runs at full heat, with daytime highs averaging 92°F (33°C) and nights around 76°F (24°C); rain falls on around 38 of the 90 days. Daylight is generous - around 10.3 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
June through August
Through June through August, Vientiane runs hot: 87°F (31°C) by day, 77°F (25°C) after dark, and rain falls on around 78 of the 90 days.
September through November
September through November sits firmly in the heat here - highs near 86°F (30°C), nights near 73°F (23°C), and rain falls on around 43 of the 90 days.
December through February
Through December through February, Vientiane runs hot: 82°F (28°C) by day, 65°F (18°C) after dark, and precipitation is sparse, near 1.5 inches (39 mm) for the season. Daylight is generous - around 10.1 hours of sun a day.
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% |