Vientiane Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Vientiane, Vientiane, Laos. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's explore the details to provide you with a complete overview.
Vientiane has a notably wet climate with abundant precipitation, recording 1948 mm (77 in) of rainfall per year. It does, however, have a distinct dry and rainy season during certain months. Have a look at our detailed charts below to see how precipitation varies throughout the year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The seasons in Vientiane, bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 399 mm (16 in) of precipitation. This rainfall is distributed across 24 rainy days.
In contrast, the driest month, December, experiences much less rainfall, totaling 10 mm (0.4 in) over 2 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.August, the wettest month, has a maximum daytime temperature of 33°C (91°F). The city receives 135 hours of sunshine in this period. During the driest month December you can expect a temperature of 30°C (86°F). For more detailed insights into the city's temperatures, visit our Vientiane Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Vientiane's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Vientiane spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Laos: City Comparison
The map below shows the annual precipitation across Laos. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Vientiane vs World: Rainfall Compared
Vientiane's average annual precipitation is 1948 mm (77 in). Let's compare this to some popular worldwide tourist destinations:
Boston, USA, experiences 1238 mm (49 in) of annual precipitation, including significant snowfall during the winter.
Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
The proximity of a location to a large body of water can significantly affect its rainfall patterns:
- Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
- Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.
- "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
- The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
- The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.
For more detailed information about Vientiane's weather, including sunshine hours, humidity levels, and temperature data, visit our Vientiane Climate page.
