San Mateo, in Cagayan Valley, Philippines, is home to roughly 16,200 people in the Asia/Manila time zone at 16.9°N latitude.
In 2025, San Mateo recorded an average annual temperature of 78°F. The hottest temperatures reached 95°F in June; the coolest were 67°F in January. Total precipitation for the year was 141 inches, with the wettest month being November.
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