**Trader sentiment for Seattle’s lowest temperature on August 26, 2026, centers on the narrow 56–59°F range because official and model guidance converges on overnight lows in the upper 50s under moderate southwesterly marine flow.** Forecasts from the National Weather Service and multiple private sources indicate partly cloudy skies with southwest winds of 5–10 mph overnight, which limits radiational cooling while advecting cooler, moister air from the Pacific. This setup typically produces minimum temperatures near the seasonal average low of ~56°F for late August, with small differences arising from exact cloud timing, wind strength, and boundary-layer moisture. Clearer periods could allow brief drops toward 56–57°F, while lingering marine stratus or slightly stronger onshore flow favors 58–59°F or marginally higher. Recent warm daytime highs in the 80s on August 25 have not produced a strong land breeze, keeping the marine influence dominant and keeping probabilities tightly clustered rather than spread across wider bins. Upcoming NWS forecast updates and high-resolution model runs overnight will provide the next key data points for resolution.