Recent forecasts from the National Weather Service and private models show Seattle's overnight low on September 6 clustering in the low-to-mid 50s°F, with ensemble spreads creating tight competition among the 50–55°F bins. A departing upper-level low and northerly flow are promoting partial clearing after earlier showers, allowing modest radiative cooling under partly cloudy skies while light winds limit extreme drops. Historical September climatology places the average daily minimum near 54.6°F, and current guidance aligns closely with that baseline. Small differences in cloud timing or boundary-layer mixing could easily shift the official minimum across the 52–53°F, 54–55°F, or 50–51°F thresholds that dominate trader positions. Updated model runs and NWS briefings over the next 48 hours will refine the exact value ahead of market resolution.