Recent NWS point forecasts and ensemble guidance for Seattle on August 4 point to sunny skies under building high pressure, with light northerly flow and minimal marine influence expected to support a daily maximum in the low-to-mid 80s. This aligns with the market's tight clustering around 84–87 °F, where traders are weighting the most probable range given model consensus and the ongoing above-normal temperature regime across the Pacific Northwest this summer. Key differentiators between the 84–85 °F and 86–87 °F bins include subtle variations in boundary-layer mixing, exact timing of any afternoon sea-breeze development, and small differences among global and regional model runs regarding downslope warming from the Cascades. Historical August climatology (typical highs near 76 °F) and the broader seasonal outlook for warmer-than-average conditions further anchor sentiment near these levels, while lower-probability tails reflect the limited chance of stronger onshore flow or unexpected cloud cover altering the outcome.