Hanoi in September
In September, Hanoi averages 31°C (88°F) during the day and 24°C (75°F) at night, with around 13 days of rain (230 mm total).
Off-peakConditions are warm and beach-friendly. Plan for unsettled weather and bring rain gear.
It's peak typhoon season in Hanoi during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Hanoi
September is in the middle of the year for warmth in Hanoi (5th of 12) and moderately rainy compared to the rest of the year (7th of 12). Daytime temperature runs 4°C above the annual average (28°C). September runs 1°C cooler than August (32°C) and cools 2°C in October (29°C).
September sunrise & sunset in Hanoi
Times shown for Hanoi local time (Asia/Ho_Chi_Minh), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Hanoi — September
Golden-hour and blue-hour windows for the 15th of September, in Hanoi's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Hanoi in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Off-peak) and Hanoi's popularity.
Crowds & pricing — September in Hanoi
This is off-peak for Hanoi — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: peak hazard season (1 active)
Sun & mosquito risk — September in Hanoi
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Hanoi in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 20°C / 68°F | 14°C / 57°F | 20 mm | 8 | 0 |
| February | 21°C / 70°F | 15°C / 59°F | 30 mm | 12 | 0 |
| March | 23°C / 73°F | 18°C / 64°F | 45 mm | 15 | 0 |
| April | 28°C / 82°F | 21°C / 70°F | 95 mm | 13 | 0 |
| May | 32°C / 90°F | 24°C / 75°F | 195 mm | 14 | 0 |
| June | 33°C / 91°F | 26°C / 79°F | 240 mm | 14 | 0 |
| July | 33°C / 91°F | 26°C / 79°F | 290 mm | 15 | 0 |
| August | 32°C / 90°F | 26°C / 79°F | 320 mm | 16 | 0 |
| September | 31°C / 88°F | 24°C / 75°F | 230 mm | 13 | 0 |
| October | 29°C / 84°F | 22°C / 72°F | 130 mm | 9 | 0 |
| November | 26°C / 79°F | 18°C / 64°F | 45 mm | 6 | 0 |
| December | 22°C / 72°F | 15°C / 59°F | 25 mm | 6 | 0 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Hanoi in September →
Frequently asked questions
How hot is Hanoi in September?
In September, Hanoi averages a high of 31°C (88°F) and a low of 24°C (75°F) — generally hot.
Does it rain a lot in Hanoi in September?
September can be fairly wet in Hanoi, with about 13 rainy days on average.
Is September a good time to visit Hanoi?
September is hot. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Hanoi in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Hanoi for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.