Matsuyama's winters are chilly, with January temperatures averaging around 5°C and February slightly warmer at 8°C. As spring approaches, temperatures rise gradually, reaching an average of 12°C in March and 15°C in April. Summer months bring warm to hot conditions, with July and August averaging 27°C, while September sees a slight decrease in temperature. Autumn is mild, with October temperatures similar to those in May, before dropping again in November and December, which are cooler than the spring months.