Forecast models from NOAA and local meteorological services indicate mostly sunny conditions over Seattle on October 4 under a strengthening high-pressure ridge, with light northerly winds and limited onshore flow supporting daytime highs centered in the low 70s°F. This setup favors the market's leading 72-73°F and 70-71°F outcomes, as offshore influences and a possible thermal trough near Puget Sound enhance warming beyond the early-October climatological average of 64-66°F. Subtle differences in model runs hinge on exact wind shifts and afternoon cloud cover, which could tip readings into the mid-70s or hold them near 70°F. Updated National Weather Service guidance and next model cycles will refine these probabilities ahead of resolution.