Flash flood threat returns to NYC area Sunday night

The New York City area is bracing for a return of rainy weather on Sunday, August 16, 2026, after a beautiful Saturday that featured mostly sunny skies, low humidity, and temperatures in the low to mid 80s. The National Weather Service and local meteorologists have issued a First Alert Weather Day for Sunday night through early Monday morning, as a southerly flow will bring increased humidity and the potential for heavy downpours. While the day will start dry with increasing clouds, showers are expected to move in from the southwest by around 3 p.m., with light to moderate rain continuing through sunset. The main concern is the overnight period, when some heavier downpours could develop, leading to localized flooding, particularly in areas southwest of the city. The forecast indicates that rainfall totals will likely range from 0.5 to 1.5 inches, with localized higher amounts possible. Although an isolated strong thunderstorm cannot be ruled out, the severe risk remains low. The rain is expected to exit quickly on Monday morning, with only a lingering shower early, followed by brighter skies in the afternoon. A hit-or-miss shower or storm is possible Monday afternoon but should be fairly isolated. This event is not expected to be a widespread heavy rain event, but the risk for heavier cells exists, and residents are advised to stay alert for potential flooding in low-lying areas.