Vientiane Weather in September

What's the weather like in Vientiane, Laos in September 2020?

The climate in Vientiane during September can be summarized as hot, humid and very wet.

September is in the fall / autumn in Vientiane and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 24°C (75°F) is normal.

Vientiane weather averages (imperial / metric)
Daytime temperature 31.7°C 89°F
Nightly temperature 24°C 75.1°F
Average temperature 27.8°C 82°F
Daily sunshine 5.4 hrs
Avg rainfall 278 mm 10.9 ins
Rainy days 20 days
Sea temperature 29.1°C 84.3°F
Humidity 83%
Windspeed 4.3kph 3 mph

On average September is the 2nd wettest month of the year in Vientiane with around 278mm 10.9 inches of rain making it a very wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.4 hours of sunshine per day.

September temperatures in Vientiane

September rainfall

September hourly sunshine

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in September 2020.

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Vientiane weather stats

Vientiane weather statistics
Hottest month: April 35.5°C 95.9°F
Driest month: December 4mm 0.2ins
Sunniest month: December 8.9hrs
Coldest month: December 28.3°C 82.9°F
Wettest month: August 332mm 13.1ins
Map showing location of Vientiane (17.96667, 102.6)

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