Agematsu is in a mountainous area of south-western Nagano Prefecture, bordered by the
Kiso Mountains to the north. The
Kiso River flows through the town.
Surrounding municipalities • Nagano Prefecture •
Kiso •
Komagane •
Miyada •
Ōkuwa •
Ōtaki Climate The town has a climate characterized by hot and humid summers, and cold winters (
Köppen climate classification Cfa). The average annual temperature in Agematsu is 10.1 °C. The average annual rainfall is 1676 mm with September as the wettest month. The temperatures are highest on average in August, at around 22.8 °C, and lowest in January, at around −2.2 °C. ==Demographics==