Recent National Weather Service and ensemble model guidance for Seattle on August 14 points to a high near 80–82°F, supported by persistent onshore marine flow from the Pacific that typically caps daytime maxima despite the broader warmer-than-average 2026 summer pattern. Zonal flow aloft and potential early sprinkles or marine-layer stratus limit surface heating and keep outcomes tightly clustered around seasonal norms of 77–81°F. Trader consensus across the closely matched leading bins reflects this forecast uncertainty, as small shifts in wind direction, cloud timing, or ridge strength could push the peak into the mid- or upper-80s or hold it in the upper 70s. Historical mid-August climatology and recent model runs reinforce the narrow range, with resolution hinging on official observations at Sea-Tac or Boeing Field.