**Trader consensus at 100% on 29°C for Taipei’s September 15 daily maximum reflects convergent forecast guidance from regional models and historical climatology for mid-September.** Official monitoring shows partly cloudy conditions with northeasterly flow, high humidity near 75–85%, and daytime peaks aligning with the 28–29°C range under typical late-summer steering patterns. Ensemble runs and station observations support this narrow band rather than deviation into cooler or warmer thresholds. A realistic shift could occur if persistent rain bands or thicker cloud cover suppress insolation enough to cap the high below 29°C, or if clearer skies and reduced moisture allow a brief spike above it—though current model consensus and the day’s advanced stage make such revisions unlikely before resolution.