With a population of around 21,100, Sasmuan sits in Central Luzon, Philippines. The city operates in the Asia/Manila time zone.
In 2025, Sasmuan recorded an average annual temperature of 81°F. The hottest temperatures reached 100°F in April; the coolest were 70°F in December. Total precipitation for the year was 107 inches, with the wettest month being July.
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