This research explores an Arduino-based prototype for monitoring heat index outdoors. Employing a hybrid project management approach with Agile principles, the project addressed iterative development and collaboration within a six-person team. The successful prototype collects temperature and humidity data, calculates heat index, and transmits data wirelessly. We discuss how the methodology facilitated iterative development, communication, and adaptability. This research offers a cost-effective approach to environmental monitoring using Arduino and valuable insights for managing Arduino prototyping projects, especially in team settings. We propose future work to improve sensor accuracy, data security, power efficiency, and data visualization capabilities.