A high-pressure ridge over the Pacific Northwest has driven spring-like conditions in Seattle on October 4, 2026, with morning low clouds and fog clearing to yield sunny afternoon skies and above-normal warmth. Official forecasts from sources including the National Weather Service and regional models project a daily high in the upper 60s to around 70°F—well above the October average of roughly 59°F—due to light northwesterly winds and subsidence that limits cloud cover and mixing. This setup positions the 68-69°F bin as the market leader at 55% implied probability, with 70-71°F as a close secondary outcome, while cooler bins reflect only modest model spread or late-day cooling. Onshore flow is expected to strengthen overnight, moderating temperatures starting Monday and aligning with trader consensus on today's peak.