National Weather Service forecasts indicate the highest probabilities of measurable rainfall on September 7, 2026, across the Southeast, where a moist airmass and lingering frontal boundary support scattered to widespread showers and thunderstorms with 50-80% probability of precipitation in areas like Florida and the Carolinas. NOAA and local NWS offices highlight afternoon convection driven by daytime heating and southwest flow, consistent with typical late-summer patterns. Model guidance shows some spread on exact coverage and totals, with slight excessive rainfall risks noted by the Weather Prediction Center for parts of South Carolina. Updated short-range forecasts and next model runs from the National Centers for Environmental Prediction will provide key refinements ahead of resolution.