The global water crisis, which is fueled by climate change and increasing demand for agricultural foods, needs a more efficient irrigation method. Conventional irrigation methods waste large quantities of water and are unable to respond to unexpected weather conditions, thus threatening food safety and lasting sustainability. This paper introduces an IoT-based Smart Irrigation System that controls irrigation using wireless moisture and temperature sensors that monitor soil temperature, humidity, moisture, and rainfall in real time, with the help of cloud-based analytics for automation. Pumps and valves are controlled based on specific water needs for crops, but allow for reduced water consumption via irrigation using data-driven decision-making. Trials show an increase in water-use efficiency compared to conventional irrigation methods, increasing the ability to weather climate shocks and supporting sustainable agriculture.