Siayan, in Zamboanga Peninsula, Philippines, is home to roughly 4,900 people in the Asia/Manila time zone at 8.3°N latitude.
In 2025, Siayan recorded an average annual temperature of 79°F. The hottest temperatures reached 91°F in April; the coolest were 71°F in August. Total precipitation for the year was 161 inches, with the wettest month being May.
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