Recent National Weather Service forecasts and ensemble model runs anchor Seattle's August 16 high near 74–77°F, with persistent marine air from the Pacific and light zonal flow aloft limiting daytime heating. These conditions produce modest thermal contrasts across the Puget Sound lowlands, where sea breezes and cloud cover typically cap afternoon temperatures 2–4°F below inland maxima. Climatological August averages of 76–79°F provide context, while current guidance shows little deviation from that baseline amid neutral ENSO influences. The tight spread between 74–75°F and 76–77°F outcomes reflects minor model differences in boundary-layer mixing and exact onshore flow strength, with traders weighting the latest observational data and short-range updates most heavily as resolution approaches.