Open Weather Station (OWS) is an open-source, Arduino-based weather station designed for affordability, stability, and ease of assembly. It measures wind speed and direction, gusts, rainfall, temperature, atmospheric pressure, humidity, and ambient light. Data is transmitted via Bluetooth to an Android device running the companion app, which stores, visualizes, and optionally uploads data to services like Wunderground, Thingspeak, Windguru, or OpenWeatherMap via Wi-Fi or cellular networks. The repository includes complete assembly instructions, schematics, and source code, enabling deployment in remote or resource-limited environments. Its modular, field-deployable design supports agricultural uses such as microclimate tracking, irrigation management, and weather-informed decision making.