**A persistent dome of high pressure over the interior Southwest is driving a prolonged Southern California heat wave, with downtown Los Angeles and inland valleys forecast to reach 95–102°F or higher on August 25, 2026.** However, the Polymarket focuses on the official high at a representative station (most likely Los Angeles International Airport or a comparable coastal site), where marine-layer influence and southwest onshore flow are keeping temperatures substantially lower. National Weather Service guidance for LAX shows a high near 83°F under mostly sunny skies after morning low clouds, consistent with recent hourly observations rising from the low 70s overnight toward the low-to-mid 80s by afternoon. This coastal moderation—driven by sea-surface temperatures and prevailing winds—explains why the market-implied probability concentrates on 82–85°F (combined ~78%). Stronger heating farther inland has limited spillover to the coast so far, while model consensus and ongoing heat-advisory criteria support only modest afternoon warming at the key measurement point. Traders are therefore pricing in the current NWS and ensemble guidance, with limited room for upside unless a late shift in wind patterns or reduced marine influence materializes before peak heating.