Recent National Weather Service guidance and ensemble model runs show an upper-level low approaching from the southwest, advecting cooler marine air into western Washington and producing mostly cloudy skies with scattered showers on August 22. This system has shifted trader consensus toward a below-normal high, with the 70–73 °F bins capturing the narrow range of forecast peaks once daytime mixing and cloud cover are accounted for. Minor differences among leading outcomes hinge on the precise timing of onshore flow, the depth of the marine layer, and the extent of afternoon clearing, all of which can alter maximum temperatures by 1–3 °F; historical climatology places the August 22 average near 76 °F, underscoring how strongly the current synoptic pattern suppresses heating. Updated model runs and NWS forecast discussions expected overnight remain the key near-term catalysts for any further odds movement.