Recent National Weather Service guidance and ensemble model consensus point to a high near 73°F in Seattle on August 27, with morning marine-layer clouds giving way to partial afternoon sunshine under southwesterly flow. This follows several days of upper-level ridging that delivered mid-80s readings earlier in the week before an onshore shift introduced cooler, moister air. Market-implied probabilities cluster on 72–75°F because small differences in cloud timing, boundary-layer mixing depth, and the strength of the marine push can easily move the daily maximum by a degree or two around the climatological normal of 75°F. Stronger or earlier onshore advection would favor the lower 70s, while more sun and weaker marine influence support the mid-70s.