Recent National Weather Service and private model guidance shows Seattle under persistent high pressure with clear skies and light northerly flow, supporting a daily high near 85–88°F on August 5 and keeping the 88–89°F and 90–91°F bins nearly tied at 34.5 % and 31 %. Ensemble spread arises mainly from small differences in afternoon mixing depth and boundary-layer moisture; drier air or slightly stronger subsidence can push readings into the low 90s, while any marine push or earlier cloud cover caps them in the mid-80s. Historical August maxima average 77–79 °F, so current conditions represent a notable warm anomaly driven by the ongoing ridge. Updated 12z and 00z model runs plus the NWS afternoon forecast discussion tomorrow will be the key data releases likely to shift trader positions.