Candon City is situated in the lower central portion of the Province of Ilocos Sur. It has a “C” shape with elevations ranging from 10 – 500 ft above sea level. The city is bounded by the municipality of Santa Lucia in the south; the municipality of Salcedo is the southeast,; the municipalities of Galimuyod and San Emilio in the east; the municipalities of Santiago and Banayoyo in the north and the South China Sea in the west.

The climate is generally dry that usually occurs from the months of October to May. However, the southernmost portion is observed to be humid and rain is evenly distributed throughout the year while the eastern part is dry with rain not sufficiently distributed. August has the most rainfall while January and February have the least. The mean temperature in the province is 27 °C. January is the coldest.