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 averaged an annual temperature of 79°F, with hottest temperatures reaching 91°F in April and lowest around 71°F in August. The city received approximately 161 inches of precipitation during the year.
View historical weather for Siayan · More cities in Zamboanga Peninsula