Yawata-shimizui's climate is characterized by mild winters, with temperatures occasionally dipping below freezing in January and December, but averaging around 6-8°C. Spring brings warming temperatures, rising to averages of 11-14°C in March and April, with occasional highs reaching up to 27-29°C. Summers are warm and humid, with July and August often seeing temperatures above 35°C, while autumn is cool and temperate, with November temperatures similar to those of spring.