Vientiane Temperature by Month

The average annual maximum temperature in Vientiane, Vientiane, Laos is 33°C (91°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Vientiane compares to cities worldwide.

The temperature in Vientiane changes very little across the seasons, maintaining a similar climate throughout the year. Maximum daytime temperatures range from a very warm 30°C (86°F) in December to a very hot 37°C (99°F) in April. Nighttime lows range from 25°C (77°F) in April to 17°C (63°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Vientiane by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. April, the city's warmest month, sees 226 hours of sunshine.

The chart below shows the average temperature throughout the year:

Vientiane's average annual maximum temperature is 33°C (91°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Vientiane, December is the coolest month, with average highs of 30°C (86°F) and humidity around 70%, considered high. In April, the warmest month, temperatures average 37°C (99°F) with 69% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

For more on Vientiane's weather, including monthly rainfall, sunshine hours, and humidity, visit our Vientiane climate page.