Recent National Weather Service and model guidance places Seattle’s September 23 maximum in the mid-60s°F, aligning with the market’s tight clustering around 64–69°F. A transitional late-September pattern featuring light southerly flow, increasing marine influence, and variable cloud cover is moderating temperatures below early-month norms near 70°F. Partly sunny conditions are expected to allow brief afternoon warming, while overnight lows in the upper 40s to low 50s limit daytime recovery. Minor differences among leading bins reflect uncertainty in exact cloud timing and boundary-layer mixing rather than major synoptic shifts. Updated model runs and morning observations on the 22nd will refine the final peak before resolution.