**Recent forecasts for Seattle’s overnight low heading into September 1 center on the mid-50s °F, consistent with the closely matched market-implied probabilities for 54–55 °F and 56–57 °F.** A warm front is expected to brush the area Tuesday night ahead of a stronger cold front arriving Wednesday, producing increasing clouds, a chance of light rain, and modest onshore flow that limits radiational cooling. National Weather Service discussions and ensemble guidance indicate this transition will keep conditions near or slightly below seasonal normals, with historical September 1 lows averaging 55.3 °F at Sea-Tac. Key variables differentiating the leading bins include overnight cloud cover and wind strength—greater mixing or lingering marine influence tends to hold minima in the upper 50s, while clearer breaks allow more cooling toward the mid-50s. Longer-range outlooks from the Climate Prediction Center also favor below-normal temperatures for the Pacific Northwest in early September, supporting the current trader consensus around the historical average while acknowledging typical model spread in the 52–59 °F range. Updated model runs and official NWS briefings through Labor Day weekend remain the primary near-term catalysts.