Current National Weather Service and private model guidance points to a sunny, stable high-pressure pattern over the Pacific Northwest, with Seattle’s August 15 high most likely in the upper 70s to low 80s. The leading market bins (76–81 °F) reflect this tight consensus, driven by typical late-summer marine-layer moderation that caps afternoon warming even under clear skies. Minor day-to-day shifts in the position of the thermal trough or onshore flow can easily move the peak by 2–3 °F, explaining why the 76–77 °F, 78–79 °F, and 80–81 °F outcomes trade within a few percentage points. Historical climatology places the Aug 15 normal near 77 °F, so the current outlook sits slightly above average but well below extremes that would push probabilities into the 82 °F+ bins. Updated model runs and the evening forecast discussion remain the key near-term catalysts.