With a population of around 5,100, Castro Marim sits in Faro, Portugal. The city operates in the Europe/Lisbon time zone.
In 2025, Castro Marim recorded an average annual temperature of 65°F. The hottest temperatures reached 99°F in August; the coolest were 40°F in January. Total precipitation for the year was 30 inches, with the wettest month being March.
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