**Trader consensus has converged on 29°C as the official highest temperature recorded in Busan on September 15, 2026, with near-100% implied probability.** Korea Meteorological Administration observations through the afternoon and evening show peak readings reaching 29–29.7°C under mostly cloudy to partly clear skies, consistent with late-summer conditions featuring light northeast winds and humidity near 60–75%. Multiple forecast models aligned on a daily maximum in this narrow range, and historical September baselines for Busan (typically 26–28°C) support the current data without indicating an outlier spike. Realistic challenges would require a late-day revision from official stations, a different measurement methodology, or an unexpected cooling trend not captured in real-time reports—scenarios that appear improbable given the volume of confirming observations.