Vientiane, Laos Climate & Monthly Averages
The climate of 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.
Climate 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.
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 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.
Climate questions, answered
What is the average temperature in Vientiane?
Is Vientiane hot in summer?
Is Vientiane cold in winter?
How many rainy days does Vientiane get in a year?
Best time to visit Vientiane
The best time to visit Vientiane is generally November to March, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 85°F (29°C).
Pack for Vientiane with lightweight, breathable clothing and strong sun protection for the hot months; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - April nights average 76°F (25°C).
Vientiane temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.