The hottest month in Vientiane is typically April, with daytime highs averaging around 34.2°C (94°F), based on 10 years of historical weather data. Overnight lows during this period average near 24.6°C (76°F).

What is the coldest month in Vientiane?

The coldest month in Vientiane is typically January, with overnight lows averaging around 17.8°C (64°F) and daytime highs near 27.4°C (81°F), based on 10 years of historical weather data.

When does the rainy season start in Vientiane?

Vientiane has a clearly defined rainy season running roughly from July to September, based on 10 years of historical rainfall data. August is typically the wettest month, averaging about 431 mm of rain. Outside this window, rainfall is much lighter for the rest of the year.

What's the best time of year to visit Vientiane?

The best time to visit Vientiane is typically December to February, when daytime highs average a comfortable 28.1°C (83°F). Rainfall during this window averages around 12 mm, well below the 431 mm seen in August, the wettest month. This is based on 10 years of historical weather data.

Is Vientiane's air quality safe right now?

As of the latest reading, Vientiane's air quality index (AQI) is 59, rated "Moderate", based on the nearest monitoring station. Air quality is acceptable, though unusually sensitive individuals may notice minor effects.

Atmospheric Details

Wind

17 km/h

ENE · Gentle Breeze · Max 18 km/h

Humidity

66 %

Comfortable

UV Index

Very High

Visibility

16 km

Excellent

Pressure

991 hPa

Low · change likely

Dew Point

20°C

Very humid

Today vs Normal

32°C+2° above normal

The long-term average high for today is 30°C.

14 of the last 28 days with published data ran above normal.

That's a break from the pattern - today's forecast runs above normal even though the recent stretch mostly ran below.

Red = above normal, blue = at or below · last 12 days

Air Quality

Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Health & Activity Advice

⚠ Limit Outdoor Time

UV index is 8 today — very high. Limit sun exposure around midday, apply SPF 30+ every two hours, and seek shade when possible.

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.