Recent National Weather Service guidance centers trader sentiment on a Seattle high near 78–81°F for August 15, reflecting moderate zonal flow aloft combined with persistent onshore marine air that limits daytime heating. This setup aligns with typical late-summer Pacific Northwest conditions, where Puget Sound and coastal influences often cap temperatures despite a broader warmer-than-average seasonal pattern. Forecasts show consensus in the mid-to-upper 70s under partly sunny skies with light variable winds, though slight model variations in marine layer depth could shift outcomes toward 76–77°F or 80–81°F bins. Historical August highs average 76–79°F with low extreme variability, keeping lower-probability tails (above 84°F or below 74°F) suppressed until new model runs or observations update the outlook.