Recent National Weather Service guidance and ensemble model consensus point to a Wednesday high near 74–77°F in Seattle, with marine air and persistent onshore flow limiting inland warming despite broader seasonal warmth across the Pacific Northwest. Afternoon sea breezes and zonal flow aloft are expected to cap peaks close to the August climatological average of 77°F, preventing significant ridge amplification or heat advection. The tight spread between the 74–75°F and 76–77°F outcomes reflects minor uncertainties in cloud timing and wind strength across model runs, while probabilities for 78°F or higher remain low absent any unexpected offshore flow development. Updated 12Z model suites and NWS briefings ahead of resolution remain the key near-term drivers for shifts in trader positioning.