Forecast models from the National Weather Service and private sources indicate clearing skies after morning clouds on October 3, 2026, supporting a Seattle high near 66–69°F under persistent high pressure and weak offshore flow. This setup favors radiative warming as afternoon sunshine increases, with northerly winds around 5–10 mph limiting mixing. The leading 68–69°F bin at 48% implied probability reflects consensus on mild early-October conditions several degrees above the long-term average, while the 27% on 70–71°F captures potential for slightly stronger insolation or model adjustments. Historical analogs show such blocking patterns often produce these exact ranges before seasonal cooling strengthens.