Kunisaki covers the northeastern part of Ōita Prefecture and almost the eastern half of the
Kunisaki Peninsula (excluding the southeastern part), and faces the Gulf of Iyo on the
Seto Inland Sea to the north and east. Settlements are scattered in areas near the sea, and the city center is located near the sea in the central eastern part of the city. The western part of the city is located in the central part of the Kunisaki Peninsula and is mountainous. The city center is located approximately 60 km by road (approximately 40 km in a straight line) from Ōita City, the prefectural capital.
Neighboring municipalities Ōita Prefecture •
Bungo-Takada •
Kitsuki Mountains • Mount Fudo (or Hudo) • Mount Futago (Futago-san) at 720m and the tallest • Mount Monju (Monju-san) • Mount Odomure • Mount Otake • Mount Takeshi Washinosu
Climate Kunisaki has a
humid subtropical climate (
Köppen climate classification Cfa) with hot summers and cool winters. Precipitation is significant throughout the year, but is somewhat lower in winter. The average annual temperature in Kunisaki is . The average annual rainfall is with June as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Kunisaki was on 10 August 2013; the coldest temperature ever recorded was on 8 January 2021. {{Weather box {{Weather box ==Demographics==