Vientiane Weather & Climate: Best Time to Visit

With minimal seasonal shifts, Vientiane experiences a constant climate year-round. Typically, average maximum daytime temperatures range from a very hot 37°C (99°F) in April to a very warm 30°C (86°F) in the coolest month, December.

Nights vary from 26°C (79°F) in April to around 17°C (63°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Vientiane has a notably wet climate with abundant precipitation, recording 1948 mm (77 in) of rainfall per year. The climate in Vientiane shows significant variation throughout the year. Expect heavy rainfall in August, the wettest month, with an average of 399 mm (16 in) of precipitation over 24 rainy days.

In contrast, the driest month December offers drier and sunnier days, with around 10 mm (0.4 in) of rainfall over 2 rainy days. For more details, please visit our Vientiane Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Vientiane serves as an ideal destination. Expect longer, more sun-filled days in December with an average of 8.3 hours of sunshine daily, and embrace the darker days in July, offering only 4.3 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Vientiane.

The city experiences its highest humidity in August, reaching 84%. In March, the humidity drops to its lowest level at 66%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The average wind speed over the year ranges from 1 m/s (2 knots) to 1 m/s (2 knots). It is lower in January, February, March, April, May, June, July, August, September, October, November and December and higher in January, February, March, April, May, June, July, August, September, October, November and December. What does this mean?

The mean monthly wind speed over the year (meters per second)