On the morning of October 16, torrential rain flooded multiple areas, particularly Nguyen Khuyen Street and low-lying parts of 2 Thang 4 Street in the former Vinh Hai Ward (now Bac Nha Trang Ward). In several places, water levels approached one meter, creating swift currents and overwhelming traffic. Motorbikes and cars stalled or were forced onto sidewalks to avoid deep water.

Water also rushed into homes and local shops, throwing residents' routines into chaos.

Similar flooding was observed along the Cao Van Be–Pham Van Dong corridor and near the Hon Chong beach area, where stretches of road up to 200 meters long were under water. According to Ms. Tran Thi Quang, “Around 1 AM, the rain was like a downpour from the sky. Water accumulated quickly and caused widespread flooding.”

Even parts of the iconic Tran Phu Street (Nha Trang Ward) resembled rivers, as rainwater overwhelmed drainage systems.

According to a 7:30 AM report by the National Center for Hydro-Meteorological Forecasting, Khanh Hoa Province experienced moderate to heavy rain between 4 and 7 AM. Forecasts indicated continued rainfall throughout the following 3 to 6 hours, with expected accumulation of 20–40mm, and localized totals exceeding 60mm.

The center also warned of potential flash floods and landslides in several areas, especially: southern and northern Ninh Hoa, northern Khanh Vinh, Cam Hiep, Cam Lam, Dien Dien, Dien Khanh, Dien Lac, Dien Lam, Dien Tho, Hoa Tri, and wards across Nha Trang including Bac, Nam, and Dong Ninh Hoa.