Overview: Matsuyama Matsuyama (Japan) is a place with a mild continental climate. The day temperatures range from 9 °C (48 °F) in January to 32 °C (89 °F) in August. The driest month is November with just 8 days of rain, on the contrary, the month when it rains the most is June with 15 days of rain. The highest night temperatures could be experienced in August with 24 °C (75 °F), the lowest in January with 2 °C (35 °F).