Recent National Weather Service and private model guidance for Seattle on August 10 shows a consensus high temperature of 76–80 °F, driven by persistent onshore flow that advects cooler marine air from the Pacific while limiting daytime heating. Light northwest winds, minimal cloud cover, and a weakening upper-level ridge have produced a modest cooling trend after earlier August peaks in the low-to-mid 80s. Small differences between the 76–77 °F and 78–79 °F bins hinge on the precise timing and depth of the marine layer intrusion versus residual downslope warming; ensemble spreads remain narrow because resolution criteria fall within normal late-summer variability for the region. Traders are therefore weighting the tightly clustered central outcomes most heavily.