When does Karnataka receive most of its annual rainfall?

Karnataka receives the majority of its annual precipitation during the southwest monsoon season, which occurs from June through September.1

While the state experiences a variety of seasonal patterns—including a post-monsoon period that brings additional rainfall via a less-significant northeast monsoon—the period between June and September remains the primary source of the state's moisture. Annual rainfall totals vary significantly across the region, ranging from approximately 20 inches (500 mm) in the drier areas of the Maidan to nearly 160 inches (4,000 mm) in the wettest parts of the coastal plain.1