With a population of around 10,200, Kastav sits in Primorje-Gorski Kotar, Croatia. The city operates in the Europe/Zagreb time zone.
In 2025, Kastav recorded an average annual temperature of 55°F. The hottest temperatures reached 93°F in August; the coolest were 24°F in February. Total precipitation for the year was 100 inches, with the wettest month being March. Snowfall for the year totaled approximately 2 inches.
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