With a population of around 25,800, Koper sits in Urban Municipality of Koper, Slovenia. The city operates in the Europe/Ljubljana time zone.
In 2025, Koper recorded an average annual temperature of 59°F. The hottest temperatures reached 99°F in August; the coolest were 29°F in February. Total precipitation for the year was 64 inches, with the wettest month being March.
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