The excessive rainfall in New York City recently is primarily due to several interrelated factors including climate change, increased atmospheric moisture, and weather patterns. Warmer ocean waters around the U.S. have caused elevated humidity levels, bringing more water vapor inland and resulting in heavier, more frequent rain. Specifically, the Atlantic and Gulf waters are unusually warm this season, fueling these rain events. Additionally, 2025 has seen historically high atmospheric moisture and more flood warnings than previous years. The city's aging infrastructure, with combined sewage and storm runoff systems, exacerbates the flooding impact. Spring's wet conditions also set the stage for a damp summer, and the lack of strong cold fronts from Canada has lessened humidity reduction. These factors combined have made heavy rains and flooding increasingly common in NYC, reflecting what experts say could be the "new normal" under climate change influences.