From the night of 16 September to the early hours of 17 September, Hanoi experienced unprecedented rainfall, with districts such as Từ Liêm recording 199 mm, Hai Bà Trưng 190 mm, Cầu Giấy 182 mm and Yên Sở 164 mm. The deluge left major thoroughfares—including Lê Quang Đạo, Dương Đình Nghệ and Thái Hà—deeply submerged, disrupting morning commutes. The Hanoi Construction Department later reported that cumulative precipitation exceeded 400 mm, causing widespread flooding across the capital.
Northern provinces
Northern provinces also saw heavy totals: Gia Viễn (Ninh Bình) 152 mm and Như Xuân (Thanh Hóa) 151 mm. The national weather service forecast continued moderate to heavy rain for the region through 17 September, with localized amounts above 130 mm, before a gradual decline from 18 September onward.
In the south
In the south, Ho Chi Minh City and surrounding provinces entered a prolonged wet spell. From 18 to 24 September, the Meteorological Centre expects 150‑300 mm of rain across the area, with isolated spots surpassing 300 mm. The system is driven by a strengthening tropical convergence zone moving southward, combined with upper‑level wind convergence. Authorities have issued a Level‑1 natural‑disaster risk warning, urging residents to avoid low‑lying districts, industrial parks and riverbanks, and to stay alert for strong winds, lightning, hail and tornadoes.
Both regions are preparing emergency response plans, monitoring drainage capacity and readying rescue teams as Vietnam grapples with one of its most extensive rain events of the year.