The Arduino Based IoT Mini Weather Station is a cost-effective and versatile project that allows users to monitor weather conditions in real-time. The project uses an Arduino Uno microcontroller and multiple sensors, including the DHT11, MQ-3, BMP180, and BH1750, to measure temperature, humidity, alcohol gas concentration, atmospheric pressure and light intensity. The data collected by the sensors is displayed on an I2C LCD 16x2 display and is sent to a cloud server using the ThingSpeak API via an ESP01 Wi-Fi module. The practical applications of the project include agriculture, outdoor activities, meteorology, and energy efficiency. The project's versatility and cost-effectiveness make it a valuable tool for individuals and organizations interested in monitoring weather conditions in real time. Overall, the project demonstrates the potential of IoT technology and the value of monitoring weather conditions in real-time.