With a population of around 2,900, Sao Marcal sits in Sao Tome Island, Sao Tome and Principe. The city operates in the Africa/Sao Tome time zone.
In 2025, Sao Marcal recorded an average annual temperature of 79°F. The hottest temperatures reached 88°F in March; the coolest were 69°F in August. Total precipitation for the year was 100 inches, with the wettest month being December.
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