The climate in Hanoi during September can be summarized as very hot, humid and very wet.
September is in the fall / autumn in Hanoi and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 25°C (77°F) is normal.
|Daytime temperature||31.2°C 88.2°F|
|Nightly temperature||24.8°C 76.6°F|
|Average temperature||28°C 82.4°F|
|Daily sunshine||6.3 hrs|
|Avg rainfall||225 mm 8.8 ins|
|Rainy days||14 days|
|Sea temperature||29.2°C 84.6°F|
|Windspeed||5.8kph 4 mph|
On average September is the 4th wettest month of the year in Hanoi with around 225mm 8.8 inches of rain making it a very wet time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.3 hours of sunshine per day.
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 Hanoi in September 2023.
|Hottest month:||July||33°C 91.4°F|
|Driest month:||December||19mm 0.7ins|
|Coldest month:||January||19.3°C 66.7°F|
|Wettest month:||August||297mm 11.7ins|