Recent National Weather Service and ensemble model guidance points to a high near 63–65°F for Seattle on September 30, driven by clearing skies and northerly flow following Tuesday’s rain-cooled air mass. Light winds and limited cloud cover should allow modest daytime warming under partly to mostly sunny conditions, consistent with late-September climatology. The closely matched market odds for extremes above 74°F or below 55°F reflect residual uncertainty in boundary-layer mixing and any late adjustments to the steering pattern, while mid-60s bins align with the current consensus trajectory. Updated short-range model runs and afternoon observations will likely refine these probabilities before resolution.