Latest National Weather Service and local forecasts for Seattle on August 21 point to a high near 79–81°F under lingering high pressure, with marine air moderation and light northwesterly flow limiting afternoon warming. Ensemble model consensus shows modest spread driven by uncertainties in daytime cloud cover and the strength of the sea breeze, which can suppress or enhance temperatures by a few degrees along the Sound. These near-term conditions align with the market’s tight clustering around 80–83°F bins, while lower odds on extremes reflect the low likelihood of significant deviations from climatological late-August norms in the absence of strong onshore or offshore flow. Updated model runs and afternoon observations will refine the range ahead of resolution.