Official National Weather Service observations at Los Angeles International Airport recorded a daily maximum of 81°F on September 30, 2026, six degrees above the 1991–2020 normal of 75°F, anchoring the 80–81°F bin at full market-implied probability. Clear skies, light afternoon onshore flow, and seasonal marine-layer suppression limited further warming despite broader regional warmth earlier in the month. Traders aligned with this outcome because resolution hinges on the verified LAX station reading rather than inland or unofficial sites. Minor uncertainty remains only if post-processing adjustments or station maintenance alter the preliminary value, though such revisions are historically rare for this metric.