The objective of this study is to clarify the effect of the sea breeze blowing over the Horikawa Canal on the urban climate in Nagoya. In summer of 2004, climatic conditions were observed at 10 fixed points along the canal. On July 23 and 26, the sea breeze was observed along the Horikawa Canal up to 9km from the sea. Two kinds of blowing-up sea breeze were observed. On July 23, it takes about 4 or 5 hours that sea breeze blew up along the canal to the north area of the city. At that time, it takes about 1 hour that the sea breeze blew up to the north area of the city in the sky. On July 26, it takes about 2 hours that the sea breeze blew up along the canal to the center of the city. At that time, it takes about 3 hours that the sea breeze blew up to the north area of the city in the sky. Each breeze affects the different effect of the sea breeze on the heat island in Nagoya.
