With a population of around 3,900, Irirum sits in Mimaropa, Philippines. The city operates in the Asia/Manila time zone.
In 2025, Irirum recorded an average annual temperature of 79°F. The hottest temperatures reached 95°F in May; the coolest were 70°F in January. Total precipitation for the year was 131 inches, with the wettest month being July.
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