**Recent National Weather Service and private forecast models indicate clearing skies and light northerly winds on September 26 following a frontal passage and widespread rain on the 25th, supporting a daytime maximum in the low-to-mid 60s.** Seattle’s marine-influenced climate, with persistent onshore flow from the Pacific, typically caps September highs near seasonal norms of ~70 °F, but the post-storm subsidence and reduced cloud cover favor modest radiative warming. Model consensus clusters the high temperature between 61–65 °F, with the narrow spread between the 62–63 °F and 64–65 °F bins reflecting uncertainty in exact cloud timing, boundary-layer mixing, and local sea-breeze effects. Official observations from Sea-Tac and downtown stations will determine the final recorded maximum, and traders are weighting the most recent NWS point forecast and ensemble guidance that keep the outcome tightly bracketed.