- Clothing
- Waterproof jacket and umbrella strongly recommended.
Tomorrow's Weather Forecast - Vientiane
Tomorrow's weather in Vientiane. high 31°C (88°F), low 23°C (73°F). Drizzle.
Tomorrow’s Outlook
Tomorrow brings a similar temperature to today. Expect heavy rain in the afternoon, with rain chances climbing as high as 73%. That risk lines up with humidity averaging 75% through the day the more moisture in the air, the more readily clouds build into showers. Humidity stays high near 75%, so it will feel muggier and stickier than the temperature alone suggests. A light breeze near 14 km/h is expected. Sunrise is at 5:57 AM and sunset at 6:14 PM, for about 12h 18m of daylight.
- Tomorrow
- 31°/ 23°
- Today32° / 26°
Tomorrow’s Hourly Weather Outlook
Morning6 AM – Noon26°
- Rain probability
- 3%
- Wind speed
- 3 km/h
AfternoonNoon – 6 PM30°
- Rain probability
- 73%
- Wind speed
- 12 km/h
Evening6 PM – Midn27°
- Rain probability
- 47%
- Wind speed
- 4 km/h
NightMidn – 6 AM25°
- Rain probability
- 0%
- Wind speed
- 14 km/h
24-Hour Rain & Temperature Forecast
Tomorrow12 Sep
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Planning Advice for Tomorrow
- Outdoor
- Not ideal for outdoor plans or car washes — heavy rain expected.
- Travel
- Expect traffic slowdowns from wet roads. Allow extra time.
Sunrise & Sunset
Sunrise
Dawn 5:27 AMTotal Daylight
Full day forecastSolar noon 12:05 PM
Sunset
Dusk 6:44 PMvs today-1 min daylight
Sunrise shift1 min later
Sunset shift1 min earlier
5-Day Weather Forecast
Full 15-Day ForecastWeather Insight
Vientiane is forecast to reach a high of 31°C tomorrow, with an overnight low around 23°C. That's 1° above the long-term average high of 30°C for this time of year. Expect a high chance of rain (73% probability) and a gentle breeze averaging 14 km/h. Air quality is currently Moderate (AQI 77), driven mainly by O₃ at 104 μg/m³.
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
Air Quality
Moderate
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.