An incoming early September Pacific storm is suppressing temperatures across western Washington, driving Polymarket odds toward a highest reading of 64–67°F on September 3. Persistent cloud cover, widespread showers, and gusty southerly winds limit daytime heating and keep highs well below the early-September climatological average of roughly 73°F. Official guidance from multiple models shows morning rain transitioning to scattered afternoon showers with a slight thunderstorm risk, further muting insolation and capping the daily peak in the mid-60s. Minor variations in shower timing and intensity create the tight spread between the 64–65°F and 66–67°F brackets, while the small tail probabilities on 68–69°F reflect residual uncertainty in how much clearing occurs before peak heating. Updated National Weather Service and model runs over the next 24–48 hours will likely refine the exact maximum before resolution.