**Forecast models and official guidance from the National Weather Service and major meteorological services currently center the overnight low for Seattle on August 31 in the mid-to-upper 50s °F, aligning with the market’s leading bins of 54–55 °F (56.5 % implied probability) and 56–57 °F (42.0 %).** This positioning reflects a transition from recent cooler, showery conditions driven by an exiting upper-level low and incoming ridge. The marine layer and northerly flow are expected to limit daytime heating while permitting moderate radiational cooling overnight under partly cloudy skies. Historical climatology for August 31 shows an average low of 55.4 °F, providing a baseline against which current model consensus sits slightly above normal but within the typical late-summer range. No significant warm-air advection or strong cold-air outbreak is indicated in the latest model runs, keeping probabilities concentrated in the 54–57 °F window. Key upcoming data points include the next NWS forecast updates and any shifts in the approaching trough, which could nudge overnight minima if cloud cover or wind patterns change.