NWS guidance and ensemble models project a high of 78–81°F at coastal Los Angeles stations for August 20, reflecting a persistent marine layer and moderate onshore flow from the cooler Pacific that limits afternoon heating. This aligns closely with the market's leading outcomes of 80–81°F (45%) and 78–79°F (29%), consistent with typical August climatology at LAX where highs average near 78°F under similar conditions. Recent observations show no significant warming trend or offshore flow to elevate temperatures further, though inland heat advisories highlight the contrast between coastal moderation and valley conditions. Updated model runs through the evening of August 19 remain the key near-term catalyst for any shifts in implied probabilities.