Current National Weather Service and local forecasts point to a high near 77–78°F for Seattle on August 19 under partly sunny skies with light onshore flow from the Pacific. This keeps afternoon temperatures in the typical late-summer range for the region, moderated by marine air and the absence of strong high-pressure ridging or offshore winds that could push readings higher. Model consensus shows only modest afternoon heating potential, with any lingering morning clouds or subtle sea-breeze effects likely capping the peak near the upper 70s. The tight clustering of market probabilities between the 76–77°F and 78–79°F bins reflects this narrow forecast spread and the inherent variability in exact maximum readings driven by short-term cloud timing and boundary-layer mixing. Updated model runs and evening observations tomorrow will provide the final resolution data.