HANOI — Northern Vietnam could begin to feel the first signs of seasonal cold air by the end of September, though meteorologists caution that the early surges will be weak and unstable, bringing little immediate change in temperatures.
The National Center for Hydro-Meteorological Forecasting reported on September 11 that between now and October 10, the number of tropical storms and depressions forming over the East Sea (South China Sea) is expected to remain in line with long-term averages. Typically, this means about two to three systems may form, with one likely making landfall in Vietnam. These storms could impact the mainland, especially coastal provinces.
Widespread heavy rain is forecast in the Red River Delta and across provinces stretching from Thanh Hóa to Quảng Ngãi. Meanwhile, southern Vietnam and other parts of central Vietnam will continue to see frequent showers and thunderstorms, with occasional days of heavy downpours.
Nationwide, the risk of dangerous weather events such as thunderstorms, whirlwinds, hail, lightning, and strong gusts remains elevated through the forecast period.
According to meteorologists, cold air masses are expected to arrive in northern provinces by late September. However, the intensity will be relatively weak and unstable at first, meaning significant drops in temperature are unlikely in the short term.
Some localized heatwaves may still occur in the northern midlands, the Red River Delta, and areas from Thanh Hóa to Huế during the early part of the forecast period.
Looking further ahead, from now until the end of November, central Vietnam could receive 10–30% more rainfall than average. Should storms or tropical depressions coincide with easterly winds and incoming cold air, meteorologists warn of the possibility of extremely heavy rainfall — raising concerns over potential historic flooding events in the central region.
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Source: Vietnam Insider