Recent National Weather Service and private model guidance points to a highest temperature in Seattle on September 5 in the upper 60s to low 70s, with most runs favoring 68–71 °F under partly sunny to overcast skies and light northerly winds. A cool, showery pattern through September 3–4 has kept daytime maxima several degrees below the 1991–2020 average high of 73 °F for the date, while modest high pressure building offshore limits afternoon heating and keeps marine influence modest. Ensemble spread remains narrow, reflecting limited potential for stronger onshore flow or clearer breaks that could push readings toward 74 °F or hold them near 66 °F. Updated model runs and afternoon observations over the next 48 hours will refine the precise maximum before market resolution.