Recent numerical weather prediction ensembles from NOAA and the National Weather Service highlight notable uncertainty in Seattle's October 9 maximum temperature, driven by variable timing of a Pacific frontal passage and marine layer depth. Model spreads produce a wide range of outcomes, with some solutions favoring cooler highs near or below 60°F under stronger onshore flow while others allow brief warming to the low-to-mid 60s before clouds increase. Historical climatology for early October shows typical highs around 64°F, but current steering patterns and sea-surface temperatures tilt probabilities toward the cooler side of the distribution. Updated model runs and morning observations will provide the next key data points for refining these forecasts.