With a population of around 20,700, Irosin sits in Bicol Region, Philippines. The city operates in the Asia/Manila time zone.
In 2025, Irosin recorded an average annual temperature of 79°F. The hottest temperatures reached 94°F in June; the coolest were 71°F in February. Total precipitation for the year was 130 inches, with the wettest month being September.
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