Vientiane, Laos Climate & Monthly Averages
The climate of 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.
Climate 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.
How Vientiane compares
- 59% of the year's precipitation falls in its wettest three months - more seasonal than 91% of the 3496 cities we track.
- Vientiane averages 79°F (26°C) across the year - warmer than 89% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| 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% |
Vientiane month by month
Vientiane weather in January
January brings highs around 81°F (27°C), lows near 64°F (18°C), about 2 wet days - typically the coldest month of the year in Vientiane.
Vientiane weather in February
February brings highs around 85°F (29°C), lows near 66°F (19°C), about 2 wet days.
Vientiane weather in March
March brings highs around 90°F (32°C), lows near 73°F (23°C), about 8 wet days.
Vientiane weather in April
April brings highs around 94°F (34°C), lows near 76°F (25°C), about 8 wet days - typically the hottest month and the sunniest month of the year in Vientiane.
Vientiane weather in May
May brings highs around 91°F (33°C), lows near 78°F (25°C), about 22 wet days.
Vientiane weather in June
June brings highs around 88°F (31°C), lows near 77°F (25°C), about 25 wet days.
Vientiane weather in July
July brings highs around 87°F (31°C), lows near 77°F (25°C), about 26 wet days.
Vientiane weather in August
August brings highs around 86°F (30°C), lows near 76°F (24°C), about 26 wet days - typically the wettest month of the year in Vientiane.
Vientiane weather in September
September brings highs around 86°F (30°C), lows near 76°F (24°C), about 26 wet days.
Vientiane weather in October
October brings highs around 86°F (30°C), lows near 74°F (23°C), about 14 wet days.
Vientiane weather in November
November brings highs around 85°F (30°C), lows near 71°F (21°C), about 3 wet days.
Vientiane weather in December
December brings highs around 81°F (27°C), lows near 65°F (18°C), about 2 wet days - typically the driest month of the year in Vientiane.
Seasons in Vientiane
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.
Climate questions, answered
How cold does Vientiane get in winter?
How warm is Vientiane on average?
How humid does Vientiane get?
When is the dry season in Vientiane?
How sunny is Vientiane?
Is Vientiane warmer or cooler than most cities?
Best time to visit Vientiane
The best time to visit Vientiane is generally November to March, when the rains have stopped and the heat has not yet peaked. Daytime temperatures in that window sit near 85°F (29°C), with rain on about 3 days a month. For the same question asked the other way round, see where else is warm in November.
Pack for Vientiane with lightweight, breathable clothing and serious sun protection and proper waterproofs rather than an umbrella - wet days are the norm here. Even in April, lows of 76°F (25°C) make an extra layer worth the space.
Vientiane temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.