The city is expected to receive 70-100 mm of rain through 1 pm on September 25, with some areas recording more than 150 mm, according to the Southern Regional Hydro-Meteorological Centre.
The city is experiencing a five-day spell of widespread rain, with several areas receiving more than 100 mm on September 21-22. Nha Be recorded the highest rainfall at 249 mm.
Forecasters attributed the prolonged rain to the intertropical convergence zone combined with a low-pressure circulation moving inland from the sea.
Intense rain also hit parts of the city on the morning of September 23, including Binh Thanh, Thu Duc and central areas, disrupting travel during the morning rush hour.
Across southern Vietnam, rainfall of 40-80 mm is forecast on September 23, with some areas receiving more than 150 mm. Rainfall is expected at 30-70 mm on September 24 before easing to 10-30 mm on September 25, although heavier downpours remain possible.
The wet weather coincides with a high-tide period. Water levels at the Thu Dau Mot monitoring station are forecast to exceed the third warning level for four consecutive days from September 24 to 27, increasing flood risks in low-lying areas.
Recent downpours have flooded several roads in HCM City, with water exceeding half a metre in some places, stalling motorbikes and disrupting traffic. Heavy rain during the evening rush hour has also caused prolonged congestion in central areas.