According to the Southern Regional Hydro-Meteorological Station, the city will experience strong daytime sunshine followed by late-afternoon and evening showers from Oct. 1 to Oct. 4.
Residents are advised to prepare for extreme downpours accompanied by thunderstorms and lightning caused by thermal convection.
The rain will be largely concentrated in the former districts of Go Vap, Cu Chi, Hoc Mon, and District 12, though central areas could also see localized heavy rain by Oct. 2.
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Heavy rain lasting more than two hours caused more than one meter flooding on Phan Huy Ich Street in former Tan Binh District, HCMC, inundating a bus and nearby homes on Sept. 30, 2026. Photo by Read/Quynh Tran |
Tran Van Hung, deputy director of the station, warned that a low-pressure trough is expected to strengthen into an intertropical convergence zone and increase rainfall on Oct. 5 and 6.
He noted that the city is currently at the peak of its rainy season. While October will see frequent downpours, the total monthly rainfall is forecast to remain around the long-term average with no signs of unusual conditions.
The incoming storms follow a massive deluge on the afternoon and evening of Sept. 30 that brought 136 mm of rain to Le Minh Xuan station, 108 mm to Thu Duc, 101 mm to Ben Cat, and 100 mm to An Phu.
The downpour coincided with high tides, overwhelming local drainage systems and severely flooding at least 12 roads, causing severe traffic jams as it happened during evening rush hour.
On Phan Huy Ich Street, floodwaters surpassed one meter in some sections, inundating buses and residential properties.
Authorities determined that the severe flooding on this road was exacerbated by dredged materials from the Tham Luong–Ben Cat–Nuoc Len Canal project.
The materials being stored temporarily in the canal narrowed the waterway and caused water to flow back into drainage pipes, which severely reduced their capacity.
As of noon on Oct. 1, some residential areas in Thu Duc remained heavily flooded.
Relevant agencies are operating pumping stations and tide-control gates while inspecting construction sites that may be obstructing drainage.
The city currently monitors 159 locations prone to recurring flooding, including 76 in the former Ho Chi Minh City, 52 in the former Binh Duong Province, and 31 in the former Ba Ria-Vung Tau Province. The latter two were merged into HCMC last year.