Forecast models from NOAA and private sources converge on an overnight low in the mid-to-upper 50s for Seattle on August 28, reflecting typical late-summer marine-layer influence that limits radiative cooling under mostly cloudy skies and light winds. Recent guidance shows highs near 70–72°F followed by gradual overnight moderation, with any shower activity further suppressing temperature drops by enhancing downward longwave radiation. The tight clustering around the 56–59°F bins stems from minor differences in boundary-layer moisture and exact cloud timing across ensemble runs, while climatological averages near 56°F provide a baseline traders weigh against current model consensus. Resolution hinges on the official minimum at Sea-Tac or equivalent station measurement.