- Best Months
- Nov–Feb
- Snowfall
- None—tropical climate, no snow recorded.
Updated July 2026 · Sources cited: weather-atlas.com, climatestotravel.com
Good to know
Good to Know
- November–February is peak tourist season—expect higher hotel rates and crowds, but weather is ideal for sightseeing.
- March–April brings extreme heat and smoke from field-burning (slash-and-burn agriculture), causing air-quality issues and respiratory discomfort until monsoon rains begin.
- July–August are the wettest months; heavy afternoon downpours can cause flooding in the city and muddy roads. Transport delays possible.
- The dry season (November–April) has two distinct phases: cool-and-comfortable (November–February) and hot-and-increasingly-humid (March–April).
- Humidity is highest during wet season (82–91% in June–August) and lowest during cool-dry season (39–49% in March–April).
- Vientiane sits on the banks of the Mekong, slightly higher elevation than surrounding lowlands. Temperature patterns are broadly typical for central Laos but slightly cooler and drier than the far south.
Seasons
Cool Dry Season
- Humidity Percent
- 49–56%
- Months
- November to February
- Characteristics
- Coolest and most pleasant period. Clear skies, low humidity, ideal for tourism.
- Rainfall Monthly Mm
- 3–28 mm
Temperature Range Celsius
- Max
- 30
- Min
- 16
Temperature Range Fahrenheit
- Max
- 86
- Min
- 61
Hot Dry Season
- Humidity Percent
- 39–40%
- Months
- March to April
- Characteristics
- Hottest months with potential air quality issues from field-burning. Brief afternoon showers begin.
- Rainfall Monthly Mm
- 34–105 mm
Temperature Range Celsius
- Max
- 37
- Min
- 24
Temperature Range Fahrenheit
- Max
- 99
- Min
- 75
Hot Transition Period
- Humidity Percent
- 67%
- Months
- May
- Characteristics
- Monsoon onset. High humidity surge. Temperature begins cooling as rains increase.
- Rainfall Monthly Mm
- 204 mm
Temperature Range Celsius
- Max
- 33
- Min
- 24
Temperature Range Fahrenheit
- Max
- 91
- Min
- 75
Wet Season
- Humidity Percent
- 82–91%
- Months
- June to September
- Characteristics
- Heavy daily rainfall, especially July–August (peak). Oppressive humidity. Afternoon downpours are short but intense. Peak rainfall month: August (~400–500 mm). River levels high.
- Rainfall Monthly Mm
- 309–402 mm
Temperature Range Celsius
- Max
- 38
- Min
- 23
Temperature Range Fahrenheit
- Max
- 100
- Min
- 73
Transition to Dry Season
- Humidity Percent
- 72%
- Months
- October
- Characteristics
- Monsoon wanes. Rainfall decreases sharply. Humidity remains elevated. Pleasant weather returns.
- Rainfall Monthly Mm
- 129 mm
Temperature Range Celsius
- Max
- 31
- Min
- 23
Temperature Range Fahrenheit
- Max
- 88
- Min
- 73
Overview
Tropical wet and dry (savanna) climate with distinct monsoon seasons. Hot and humid year-round.
Snowfall
None—tropical climate, no snow recorded.
Annual Statistics
- Average Humidity Percent
- 79
- Total Rainfall Mm
- 1600
- Rainy Days Per Year
- 118
- Total Rainfall Inches
- 63
- Mean Temperature Celsius
- 27.5
- Mean Temperature Fahrenheit
- 81.5
Best Months To Visit
Best Months To Visit
- November
- December
- January
- February
Extreme Temperatures
- Month Of Coolest
- December
- Month Of Extreme Heat
- April
- Lowest Recorded Celsius
- 9
- Highest Recorded Celsius
- 42
- Lowest Recorded Fahrenheit
- 48
- Highest Recorded Fahrenheit
- 107
Worst Months To Visit
Worst Months To Visit
- July
- August
- March
- April
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Vientiane
Data last updated July 2026 · Verify anything important.