Seattle's June 26 high temperature market centers on competing National Weather Service and model guidance showing a likely peak in the mid-60s amid a strengthening marine layer and onshore flow that limits daytime warming. Persistent low stratus and drizzle potential, typical for late June near Puget Sound, cap solar heating and keep readings below the seasonal average of 70–71 °F. Recent model runs differ modestly on cloud timing and thickness, creating the narrow spread between the 64–65 °F and 66–67 °F bins that dominate implied odds. Traders weigh these variables against historical climatology and the absence of strong offshore winds that could otherwise push readings higher. Updated NWS briefings and morning sounding data will refine the exact maximum before resolution.