Trader consensus positions 78-79°F as the leading outcome for Seattle’s August 11 high temperature, driven by National Weather Service forecast models showing stable summer conditions with moderate onshore flow and limited upper-level ridging. Current ensemble guidance clusters daily maxima in this narrow band, consistent with climatological August averages near 76°F and recent observational trends indicating subdued heat advection from the Pacific. The 20% probability assigned to 80-81°F reflects residual uncertainty in short-term model runs, while cooler bins capture lower-end variability. Updated NOAA briefings and next model cycles remain key catalysts that could shift implied probabilities if thermal profiles or wind patterns evolve.