SeasonScore
Hanoi, Vietnam
Photo: Nam-ho Park · CC BY 2.0

Vietnam

Hanoi in September

🌧️ Rainy season

Hot, humid and very wet. Watch for hazy air and tropical cyclone risk.

🎒 Pack: light, breathable clothes & sunscreen · compact umbrella or rain jacket · quick-dry fabrics · N95 mask for hazy days

Best months: Nov (8.3), Feb (7.8), Mar (7.5)

‹
Every month at a glanceTap a month to open it
›

Why September scores 6.0What goes into the score

How it works
🌡️ 32° / 25°C🌧️ 228 mm💧 dew pt 25°🍃 PM2.5 57
  • Weather comfort5.9
    • ✓Hot (32°C highs / 25°C lows)
    • !Very humid/sticky (dew point 24.6°C)
    • !Wet: ~228 mm rain, ~6 heavy-rain days
  • Air quality3.6
    • !Unhealthy (PM2.5 ~57 µg/m³)
  • Seasonal hazards8.0
    • !Tropical cyclone: Peak of the Western Pacific typhoon season
    • !Flood: ~6 heavy-rain days in an average September
  • Safety baseline7.5
    • ·Increased caution
Compare monthsPut September side by side with another month
SepNov
Score6.0 Fair8.3 Very good
Season🌧️ Rainy season🌦️ Shoulder (showers)
High / low32° / 25°27° / 20°
Rain228 mm61 mm
Humiditydew pt 25°dew pt 18°
PM2.557 µg/m³37 µg/m³

Typical-month data: NASA POWER (MERRA-2 reanalysis) 2015–2024 (modelled, not a forecast). Temperatures: Hanoi weather-station normals. Rainfall: downtown Hanoi weather-station normals (national met service).

Holidays & crowdsSeptember 2027

Long weekend

There's at least one long weekend. Domestic travel picks up and popular spots get busier over those days.

  • National Day 2–5 Sep · 4 days off in a row

National holidays only; regional holidays and school breaks aren't included. Source: holidays (open-source public-holiday calendar).

Explore HanoiEvents, sights, food & souvenirs

Check event dates locally

Vietnam's capital, with a lakeside centre, a busy Old Quarter, French colonial buildings, ancient temples and an outstanding street food culture.

Events in September
National DayEvery year2 September every year

Marks Vietnam's declaration of independence in 1945, with flags and official celebrations.

Why go: A public holiday; the mausoleum area may be closed to visitors.

Where: Ba Dinh Square and citywide

Mid-Autumn FestivalDate variesLunar calendar - usually September or early October

A children's festival with lanterns, lion dances and mooncakes.

Why go: Hang Ma street is packed with lantern stalls in the weeks before.

Where: Hang Ma street and the Old Quarter

Coming up later

Tet (Lunar New Year)Date variesLunar calendar - late January to mid-February, date moves each year

Vietnam's biggest holiday, with flower markets, family visits and temple outings.

Why go: Many shops and restaurants close for several days; transport is heavily booked.

Where: Citywide

Perfume Pagoda FestivalDate variesLunar calendar - usually from the 6th day of the 1st month into spring

A major pilgrimage to a complex of cave temples reached by boat through limestone scenery.

Why go: Expect huge crowds, especially in the first weeks.

Where: Huong Pagoda, south-west of Hanoi