Kartepe is a town located in the Kocaeli province of Turkey. The town has a humid subtropical climate, with hot and humid summers and cool and rainy winters. In the summer months (June to September), temperatures in Kartepe typically range from 25°C to 30°C, with high humidity levels. In the winter months (December to February), temperatures range from 0°C to 10°C. The area can also experience occasional thunderstorms during the summer. Overall, Kartepe has a mild and pleasant climate throughout the year, with warm summers and cool winters.