**Current forecasts from multiple sources, including WeatherBug, local meteorological services, and model guidance, point to overnight lows in Seattle on August 27 centering on the mid-to-upper 50s°F, with the strongest consensus around 57–60°F.** This positions the 58–59°F outcome as the market leader at 49% implied probability, closely followed by 60–61°F at 36.5%, reflecting trader aggregation of real-time model runs and surface observations. Key scientific drivers include the advection of cooler, moister Pacific maritime air under southwesterly flow, which limits daytime heating and promotes modest overnight radiational cooling under partly cloudy skies. Dew points in the low-to-mid 50s and light winds further support minimum temperatures near the seasonal normal of 55.9°F for the date, without the clear, calm conditions needed for deeper cooling into the low-to-mid 50s. Recent developments show a shift from earlier August warmth (highs near 80°F) to this milder regime, with no strong high-pressure ridge or cold-air intrusion to push probabilities lower. Model spread remains modest, keeping 56–57°F and 62–63°F as secondary possibilities but with lower odds. The market’s pricing captures this evidence-based range while acknowledging typical forecast uncertainty in boundary-layer temperature evolution over the urban heat island and Puget Sound.