What to expect in Hanoi in September
September is a mixed month in Hanoi. You get 31° / 24°, but manageable crowds at the big attractions. Worth it for the right traveller.
Hanoi weather in September
Typical conditions in Hanoi during September, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 31°C 88°F |
|---|---|
| Average low | 24°C 75°F |
| Rainfall | Wet 55/100 |
| Total rainfall | 195 mm7.7 in |
| Rainy days | 14 |
| Daylight | 12 h 16 min |
| How it feels | Hot — midday shade matters |
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
This month counts as shoulder season: prices close to the yearly average.
What to pack
Lightweight, breathable clothes, strong sun protection and a refillable bottle — highs near 31°C make midday heat the main constraint. Add a compact rain shell and shoes you do not mind soaking; this is one of the wetter months.
What it costs
Costs in September sit around the yearly average for Hanoi — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 25% less.
Who this month suits
- Anyone travelling on a budget
- People who would rather have space than perfect conditions
- Visitors who want to catch a festival
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.
Hanoi in September compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| July | 33° / 26° | Low | $ | 58 |
| August | 32° / 25° | Low | $ | 58 |
| September · This month | 31° / 24° | Moderate | $$ | 58 |
| October | 28° / 21° | High | $$ | 55 |
| November | 24° / 18° | High | $$ | 61 |
These months score higher for Hanoi on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in September
If the destination is negotiable but the month is not, these places are at their best in September.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
