Campus areas as a microcosm of urban areas; given the context of global warming, are becoming more vulnerable to rising temperatures. This study focuses on the outdoor environment and microclimate effects on the Ozyegin campus by considering the surface and plantation types. Urban green spaces offer a potential solution by lowering air temperatures through shading and evapotranspiration. The selection of appropriate plant types is crucial for effective temperature reduction, as leaves act as barriers to solar radiation. Measurements were conducted in November–December 2023 at 15 designated points in the Ozyegin campus. The measurements are especially conducted in the autumn and diffuse daylight to prevent the effect of direct solar radiation and the high difference in the shading effect of trees. The research seeks to address fundamental questions about how different surfaces, both hard and soft, influence outdoor thermal conditions, explore university campuses, and explore strategies for improvement. Employing comprehensive field surveys and data analysis, including statistical techniques like ANOVA, and Bonferroni post-hoc test, the study reveals temperatures under broad-leaved trees are 1.5 degrees cooler than on hard surfaces. With a practical objective, the research aims to measure outdoor thermal conditions at Ozyegin Campus and make recommendations for creating comfortable campus outdoor environments.