Recent National Weather Service and model consensus indicate Seattle's October 5 high will likely reach the mid-to-upper 60s as a thermal trough weakens and onshore flow returns after weekend warming. This pattern favors 66–69°F outcomes, which dominate market-implied odds near 61%. Key differentiators include the strength and timing of the marine push, afternoon cloud cover, and any residual downslope warming—factors that can shift the peak by 2–4°F. Historical early-October averages near 64°F provide context, but current high pressure has already produced above-normal readings. Updated model runs and NWS briefings over the next 48 hours will refine the exact maximum before resolution.