Recent National Weather Service and GFS ensemble guidance for Seattle on October 1 points to a daytime high near 63–66°F under partly cloudy skies with light northwesterly flow and minimal precipitation risk, consistent with early-fall climatology where marine air moderates temperatures around the 65°F seasonal average. The closely matched market-implied odds across multiple bins reflect genuine model spread arising from uncertainties in cloud timing, boundary-layer mixing, and subtle steering patterns, rather than a single dominant solution. Updated model runs over the next 24–48 hours will likely tighten the distribution ahead of market resolution.