Hikari, Japan experiences a temperate climate with distinct seasonal changes. Winters are quite chilly, with temperatures ranging from -8°C to 16°C on average in January and December. As spring arrives in March, temperatures gradually warm up to an average of 12°C, while summers are hot and humid, with highs often reaching over 30°C from June to August. Autumn brings a slight cooling trend, with temperatures dropping back down to around 10-15°C by November.