Recent National Weather Service and private model guidance points to a Seattle high near 77°F on August 3 under weak onshore flow and partial marine-layer influence, keeping values clustered in the mid-to-upper 70s. Above-average summer conditions driven by persistent ridging and a strengthening El Niño pattern have elevated baseline temperatures several degrees above the 1991–2020 climatology, yet the timing of any onshore push or cloud cover remains the key uncertainty separating the tightly matched 76–77°F and 78–79°F market bins. Ensemble spreads show limited upside risk above 80°F, consistent with the low single-digit probabilities assigned to those outcomes. Final model runs and morning observations on August 3 will determine resolution.