National Weather Service forecasts and ensemble model consensus indicate Seattle's August 11 high will likely reach the upper 70s under mostly sunny skies with light onshore flow from the Pacific, moderating temperatures near seasonal norms. Persistent marine influence and stable high pressure have suppressed warm-air advection that produced upper-80s readings earlier in the month, keeping the latest runs clustered around 77–80°F. This pattern aligns with the long-term August average high of 76–79°F and explains why traders assign the strongest implied probabilities to the 78–79°F and 80–81°F bins. Updated NWS briefings and morning model runs on August 11 will provide the final observational data for market resolution.