Weather
Average highs sit around 31°C with lows near 24°C. Rainfall is moderate; the odd shower is likely.
Crowds & demand
Crowd levels are Moderate for Hanoi — manageable crowds at the big attractions.
Prices & value
Prices run mid-range this month: prices close to the yearly average.
Events & what’s on
Look out for Vietnamese Independence Day, Mid-Autumn Festival while you’re there.
- Vietnamese Independence Day — National Day parades and fireworks mark independence from France.
- Mid-Autumn Festival — Lanterns and mooncakes fill the Old Quarter for children's festivities.
The verdict
September is a mixed month in Hanoi. You get 31° / 24°, but manageable crowds at the big attractions. Worth it for the right traveller.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated July 2026
