Kocaeli's climate is characterized by mild springs and autumns, with temperatures gradually warming up from March to May. Summer months are hot and dry, with July and August being the warmest, while September sees a slight cooling trend. Winters are chilly, with January and December being the coldest months. Temperatures often fluctuate significantly between day and night throughout the year, but averages remain relatively consistent around 7-12°C in spring and autumn, and 25°C in summer.