With a population of around 109,000, Mong Cai sits in Quang Ninh, Vietnam. The city operates in the Indochina time zone.
In 2025, Mong Cai recorded an average annual temperature of 73°F. The hottest temperatures reached 94°F in July; the coolest were 44°F in January. Total precipitation for the year was 92 inches, with the wettest month being July.
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