Marine layer moderation combined with persistent onshore Pacific flow is driving trader consensus toward an 80–81°F high for downtown Los Angeles on August 21, with 78–79°F as the clear secondary outcome. National Weather Service guidance currently points to highs near 78°F in the immediate coastal and basin areas, reflecting post-heat-wave cooling that has kept readings well below inland peaks. This pattern aligns with typical late-August climatology when marine influence strengthens, suppressing daytime maxima despite broader regional warmth. Recent model runs reinforce the outlook, limiting upside risk to the lower-probability 82°F+ bins while elevating the combined 77.5% implied probability on the 78–81°F range.