Outdoor open spaces are essential to the physical development of the University of the Philippines (UP) towards its pursuit of academic excellence, especially since the balance between “green” open spaces and built environment is a vital part in designing an urban campus. Specifically, thermal comfort and climate change are important factors to consider in providing a comfortable learning environment. This study aims to determine the perception of outdoor thermal comfort and actual uses by UP Diliman students of selected outdoor open spaces vis-à-vis the intended functions. Upon analysis of the behavior and preferences of UP students regarding the use of outdoor open spaces, several factors related to outdoor thermal comfort, accessibility, convenience, and landscape design have been derived, such as protection from direct sunlight, natural ventilation, lighting, benches for seating, and convenience through accessibility – all of which had been considered by the students in selecting and utilizing the selected outdoor open spaces. Moreover, these outdoor spaces exhibit flexibility in terms of their uses and functions for the students and the public.