The observed high temperature in Los Angeles on September 16 aligned with the 78-79°F range, producing the market's near-certain consensus on that outcome. National Weather Service station data and supporting meteorological observations confirmed this value under typical late-summer conditions, including moderate onshore flow and limited marine layer influence that prevented significant warming or cooling. Historical September averages for downtown Los Angeles fall near 80°F, providing context for why this reading represented a modest deviation rather than an extreme. Resolution hinges on official daily maximums from designated stations, leaving minimal room for revision unless post-analysis adjustments to instrumentation or siting occur, scenarios that have proven uncommon in recent records.