Hanoi Weather in September
In September, Hanoi averages a high of 32°C (89°F) and a low of 25°C (77°F), from 16 years of daily records (1975–2026).
32°C
Average high
89°F
25°C
Average low
77°F
38°C
Record high
100°F · September 5, 2024
20°C
Record low
68°F · September 26, 1987
What September Is Like in Hanoi
- September 2025 was the warmest September in 16 years of records, 0.9°C (1.7°F) above the long-run average.
- Hanoi's hottest September day on record is a recent one: 38°C (100°F) on September 5, 2024.
- The coldest September reading, 20°C (68°F) on September 26, 1987, has not been matched in 39 years.
- A typical September brings 1.5 days above 35°C (95°F).
At least 1 mm of rain falls on 31% of September days.
Warmest: 2024 (33.3°C)Latest: 2025 (32.2°C)10-year averageLong-run average (31.5°C)
Look Up a Day in September
See the weather in Hanoi on any September date, year by year.
Source: NOAA GHCN-Daily, Noibai Intl (1974–2016); Ha Dong (2012–2026). Averages cover 1975–2026. How we compute this