Si Ma Cai is a city of approximately 5,700 people in Lao Cai, Vietnam. Located in the Indochina time zone at 22.7°N latitude.
In 2025, Si Ma Cai recorded an average annual temperature of 66°F. The hottest temperatures reached 88°F in June; the coolest were 35°F in January. Total precipitation for the year was 68 inches, with the wettest month being June.
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