The mercury will drop to 11-14 degrees Celsius and even below 5 in high mountains.
Rains and showers are expected in the northern and north-central regions on February 8-9.
Elderly are advised to stay indoor to avoid risks of stroke and residents of mountainous regions refrain from engaging in outdoor activities and burning coal in closed rooms for heat.
Measures need to be taken to protect and keep crops, cattle and aquatic farms warm, especially in mountainous localities.
From February 8 afternoon, the northern part of the East Sea/South China Sea, including the waters around the Hoang Sa (Paracel) archipelago, is expected to see strong northeasterly wind and rough sea.