Vientiane Weather in September

September in Vientiane brings very high temperatures, with daytime highs of 33°C (91°F) and nights around 25°C (77°F). It's part of the rainy season, with 309 mm (12 in) of rainfall on average, so an umbrella or poncho is a good idea.

Rainfall in Vientiane in September

As part of the rainy season, Vientiane sees around 20 days of rain in September, with an average of 309 mm (12 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.

Temperature in Vientiane in September

Daytime highs in Vientiane in September reach 33°C (91°F), with nights around 25°C (77°F). It's usually most comfortable outside during the morning and later in the day. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.

Sunshine in Vientiane in September

You can expect a moderate amount of sunlight, with approximately 168 hours. Even though this month is part of the wet season, you can still see the sun occasionally.

Wind Speed in Vientiane in September

September has wind speeds averaging 1 m/s (2 knots). You can expect very gentle conditions with light air movement on typical days. Since this is an average, daily weather varies from perfectly still moments to some breezier days.

September in Vientiane has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.