Perched 1,500 meters above sea level, Mau Son was the first to feel the full brunt of the cold air, dipping two degrees from Oct. 22 and six from Oct. 20.

Motorbike riders wear warm clothing on Long Bien Bridge, Hanoi, northern Vietnam.

Other highland areas also saw sharp drops: Sin Ho (Lai Chau) hit 12 degrees, Sa Pa (Lao Cai) 13 degrees, and Moc Chau (Son La), Tam Dao (Phu Tho), and Dong Van (Tuyen Quang) all slipped below 15 degrees.

In the northern delta, early morning temperatures hovered below 20 degrees. In Hanoi, readings at five weather stations: Ba Vi, Son Tay, Hoai Duc, Ha Dong and Lang, all showed 18 degrees, down 4–6 degrees from earlier this week. The day’s high is expected to reach only around 23 degrees.

The cold air mass has also spread south into central Vietnam, bringing lows of 18 degrees in Thanh Hoa and Ha Tinh, 19 degrees in Nghe An, 20 degrees in Dong Hoi, and 21 degrees in Quang Tri.

The National Center for Hydro-Meteorological Forecasting said the cold spell will continue to affect northern Vietnam and Thanh Hoa through Friday, with lows ranging from 19–21 degrees in the northeast, 17–19 degrees in midland and mountain areas, and below 16 degrees in high elevations.

U.S. weather service AccuWeather forecasts Hanoi's temperatures at 20–24 degrees on Oct. 23 and 24, warming to 28–30 degrees by the weekend. In Sa Pa, highs will climb from 17 degrees to 19 degrees by Sunday.

Meteorologists expect cold fronts to intensify in December 2025 and January 2026, with widespread severe cold, defined as daily averages below 15 degrees, likely in northern Vietnam from late December onward.

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