Gampaha's climate is characterized by a moderate tropical environment with temperatures steadily rising from January to April, peaking in June at an average high of 38°C. The summer months, May to July, bring cooler temperatures, averaging highs around 28-34°C. Autumn sees a slight drop in temperature, ranging from 20-33°C, while spring is similar to autumn with minor fluctuations. Winter brings slightly warmer days, averaging highs of 27-34°C.