With a population of around 3,800, Sao Mateus sits in Azores, Portugal. The city operates in the Atlantic/Azores time zone.
In 2025, Sao Mateus recorded an average annual temperature of 63°F. The hottest temperatures reached 81°F in August; the coolest were 45°F in February. Total precipitation for the year was 76 inches, with the wettest month being January.
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