Winters in Shiogama are chilly and unpredictable, with temperatures ranging from -11°C to 13°C, averaging around 0°C. Spring brings gradual warming, with April being the warmest month so far, averaging 11°C. Summer is hot and humid, with July and August often seeing temperatures above 35°C, while September's temperatures drop slightly. Autumn sees a return to cooler temperatures, but still mild, ranging from 4°C to 30°C in October.