Recent National Weather Service guidance and ensemble model runs indicate Seattle's August 20 high will most likely fall in the upper 70s to low 80s, consistent with the market's near-tie between the 80–81°F and 82–83°F bins. Persistent weak upper-level ridging and above-normal sea-surface temperatures in the northeast Pacific have supported a warmer-than-average summer pattern, including Seattle's 14th consecutive hotter-than-normal season, though moderating onshore flow from Puget Sound typically caps daytime maxima. Forecast uncertainty stems from small differences in cloud cover and boundary-layer mixing on the 19th–20th transition, with historical August averages near 77–79°F providing limited precedent for extremes above 85°F this late in the month. Updated NWS point forecasts and morning model runs will refine the exact peak before resolution.