**Official meteorological observations for Chengdu on September 28, 2026, recorded a daily maximum of 25°C under persistent overcast skies with light rain and light northeasterly winds, aligning precisely with the market's sole outcome.** This outcome reflects verified surface measurements from authoritative stations, where cloud cover and precipitation suppressed typical late-September solar heating that might otherwise push highs toward 27–29°C. Regional patterns, including seasonal transition and moderate humidity near 75–85%, supported this moderate peak, consistent with historical September averages near 25–27°C. While 100% market-implied odds indicate strong consensus backed by real-time data, minor revisions in official post-processing or station-specific readings could theoretically alter resolution if discrepancies arise before final confirmation.