Latest National Weather Service forecasts indicate a high near 69°F for Seattle on August 29, with morning rain likely followed by partly sunny skies and a chance of afternoon showers or isolated thunderstorms. This setup, driven by a passing upper-level low and associated marine air, keeps temperatures in the mid-to-upper 60s or low 70s depending on cloud cover and precipitation timing. Ensemble guidance shows modest spread around these values, with rain-cooled boundary layers potentially capping the peak below 70°F while partial afternoon clearing supports the upper end of the range. Historical late-August Seattle highs average near 75°F, but the current synoptic pattern favors cooler outcomes, aligning with the closely matched 66–69°F market-implied probabilities. Updated model runs and afternoon observations will refine the exact maximum before resolution.