Overview: SapporoSapporo (Japan) in general has a mild continental climate. The day temperatures range from 0 °C (31 °F) in January to 26 °C (79 °F) in August. The least rainy month in Sapporo is June with its 9 days of rain, the rainiest month is January, when it rains 23 days. The highest night temperatures could be experienced in August with 19 °C (66 °F), the lowest in January with -7 °C (19 °F).