Trader consensus has coalesced on a 31°C high for Taipei on September 9 because Central Weather Administration forecasts explicitly project a daytime maximum of 31°C under partly cloudy skies with brief showers and easterly winds. Recent model consensus and observational trends align with this threshold, consistent with typical early-September maxima near 30–31°C amid humid subtropical conditions. The near-100% implied probability reflects strong alignment between official guidance and real-time data, with limited divergence across ensemble runs. Only unexpected shifts in steering patterns or measurement discrepancies at official stations could realistically alter the outcome before final reporting.