Metro Manila is highly vulnerable to climate-related hazards, including extreme rainfall and temperature events. Due to the thermal difference between the lake and the surrounding land, lakes can influence local weather and climate. Shallow lakes such as Laguna Lake are highly responsive to atmospheric conditions. Its influence can further extend to other meteorological variables, like humidity and water vapor. Hence, studying the role of Laguna Lake in the local climate is increasingly important. This study aims to evaluate the influence of Laguna Lake on temperature and precipitation. Specifically, it will characterize the lake effect on daytime and nighttime temperatures. The study will also analyze the intensity and distribution of convective rainfall in connection with the lake’s presence during easterlies. The study used the Weather Research and Forecasting (WRF) model to quantify Laguna Lake’s influence on local climate. Two experiments were conducted: a control experiment, and another where Laguna Lake was replaced with natural vegetation. The diurnal cycle of 2-m air temperature revealed that the lake’s presence decreases daytime temperature and increases nighttime temperature by around 3°C. During the day, the lake serves as a cool source, but at night, it acts as a heat source. Moreover, rainfall simulations showed how the lake influences rainfall and is a factor for rainfall enhancement. Laguna Lake suppresses rainfall over the lake while enhancing rainfall inland in its surrounding areas.The results of this study can provide a deeper understanding of how lakes influence local climate, especially the temperature and precipitation. The findings can also serve as a basis for government agencies in developing preparedness plans to address the lake’s climate-related effects.