Recent National Weather Service guidance and ensemble model runs indicate a high likelihood of maximum temperatures near 80°F at key Los Angeles stations on August 21, driven by persistent onshore marine flow and a moderating marine layer that limits afternoon heating despite clear skies. This aligns with climatological norms for late August, when downtown and basin sites typically reach 78–84°F under neutral-to-weak offshore pressure gradients. Stronger warming would require pronounced downslope winds or a sharper ridge, scenarios currently assigned low probability in short-range forecasts. The market’s heavy weighting toward the 80–81°F bin at 43.5% reflects this consensus, with adjacent 78–79°F and 82–83°F outcomes capturing residual model spread and timing uncertainty ahead of the final observation window.