Recent National Weather Service model consensus points to moderating marine air and increasing afternoon cloud cover as the main factors capping Seattle's highest temperature on August 10 in the mid-to-upper 70s. Trader-implied odds cluster tightly around 76–79°F because ensemble guidance shows limited daytime heating despite the broader Pacific Northwest's above-normal summer pattern, with sea breezes and typical August marine layer effects expected to keep peaks below 80°F. Minor model spreads arise from uncertainty in exact cloud timing and wind shifts, while historical August averages near 78°F provide context for the current distribution. Updated NWS briefings tomorrow morning will likely refine the final observed maximum before market resolution.