Nantan is located in the southern part of the Tamba region in central Kyoto Prefecture.
Neighbouring municipalities Fukui Prefecture •
Ōi Hyōgo Prefecture •
Tamba-Sasayama Kyoto Prefecture •
Ayabe •
Kameoka •
Kyōtamba •
Kyoto Osaka Prefecture •
Nose Shiga Prefecture •
Takashima Climate Nantan has a
humid climate (Köppen
Cfa) characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Nantan is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . Its record high is , reached on 27 July 2023, and its record low is , reached on 28 February 1981. {{Weather box {{Weather box ==Demographics==