When to go · Hanoi
Hanoi in September
Mixed month. Still hot; Sep 2 holiday.
Key facts
- Verdict
- Mixed
- Temperature
- 31° / 25°
- average high / low
- Rain days
- 13
- Crowds
- Medium
- Vietnam overall
- Prices
- Medium
- Vietnam overall
Verdict
Still hot; Sep 2 holiday.
Weather in September
- HanoiHighs around 31 °C, lows around 25 °C, rain on about 13 days
- North, Vietnam · Hanoi, Hạ Long, Ninh Bình, Sa Pafine
Four seasons: cool grey winters (Sa Pa can reach 0 °C), humid hot summers with storms Jul–Sep; Hạ Long cruises cancel on storm warnings.
Autumn season
The best walking weather: green rice flakes (cốm) in September, milk-flower scent in October, Mid-Autumn lanterns on Hàng Mã.
Watch: 2 September closures; the rush for October rooms.
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
National Day
2 September (holiday, often a long weekend) · Ba Đình, Hoàn Kiếm
Flags everywhere; parades in anniversary years; closures around Ba Đình Square. Mausoleum often shut around the date.
Mid-Autumn Festival (Tết Trung Thu) check
15th of the 8th lunar month; around 15 September in 2027 · Hàng Mã and the Old Quarter
Lantern and toy stalls fill Hàng Mã for two weeks; lion dances; mooncakes everywhere. Very crowded on the evenings before the full moon.
Crowds and prices
- Crowds · Vietnam overall
- Medium
- Prices · Vietnam overall
- Medium
Vietnam overall: Typhoons shift to the centre; the north improves late in the month.
What to pack
- Light, breathable clothes, a sun hat and sunscreen
- A rain jacket or umbrella and shoes that dry fast