Hanoi weather in September
September is a fair month to visit Hanoi: highs of 30°C (86°F) and about 223 mm (8.8 in) of rain on average. Nights average 23°C (74°F) and cloud cover 73% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 6th warmest. Compared with August, it is cooler and drier; October brings highs of 28°C (82°F) and 124 mm (4.9 in) of rain.
Figures are long-term averages for Hanoi, the largest city in Hanoi. See below for other places.
Is September a good time to visit Hanoi?
fair month Weather score 48/100.
September is a fair month in Hanoi. The weather is usually best in Nov–Apr.
Does it rain a lot in Hanoi in September?
Yes, it is one of the rainy months: about 223 mm (8.8 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Hanoi in September?
Days average 30°C (86°F) and nights 23°C (74°F).
Hanoi weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 20°C (69°F) | 11°C (51°F) | 32 mm | 76% | best |
| February | 23°C (74°F) | 13°C (55°F) | 22 mm | 81% | best |
| March | 27°C (80°F) | 16°C (61°F) | 49 mm | 85% | best |
| April | 30°C (87°F) | 20°C (68°F) | 78 mm | 83% | best |
| May | 32°C (89°F) | 23°C (74°F) | 179 mm | 80% | fair |
| June | 32°C (89°F) | 25°C (77°F) | 201 mm | 87% | fair |
| July | 32°C (89°F) | 25°C (77°F) | 300 mm | 85% | least pleasant |
| August | 31°C (88°F) | 25°C (77°F) | 322 mm | 83% | least pleasant |
| September | 30°C (86°F) | 23°C (74°F) | 223 mm | 73% | fair |
| October | 28°C (82°F) | 20°C (68°F) | 124 mm | 64% | fair |
| November | 25°C (76°F) | 16°C (60°F) | 52 mm | 61% | best |
| December | 21°C (69°F) | 11°C (52°F) | 25 mm | 66% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Hanoi in September
Weather can differ a lot within Hanoi: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Hanoi | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Đống Đa | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Long Bien | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Bắc Từ Liêm | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Gia Lâm | 31°C (87°F) | 24°C (74°F) | 232 mm | least pleasant |
| Hai Bà Trưng | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Thanh Xuân | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Cầu Giấy | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Ba Vì | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Sơn Tây | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Ba Dinh | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |
| Tây Hồ | 30°C (86°F) | 23°C (74°F) | 223 mm | fair |