**Official meteorological observations for September 17, 2026, have established a daily maximum of 28°C in Qingdao, driving the market's near-certain pricing.** Coastal station data from the China Meteorological Administration reflect typical mid-September conditions, with moderate southerly flow, high humidity, and partial cloud cover preventing further intensification beyond this level. Historical baselines for the period average near 26°C, making the observed peak consistent with seasonal norms yet distinguishable from cooler model runs projecting 25–26°C. Traders assign negligible probability to alternative outcomes because resolution hinges on verified station maxima rather than forecasts or unofficial readings. Only a post-event data revision or station-specific discrepancy could alter the outcome, though such adjustments remain rare once daily summaries are finalized.