Trader sentiment for Taipei’s July 12 maximum temperature clusters tightly around 34–38°C, reflecting genuine uncertainty in short-range ensemble forecasts. Global models show modest spread in the strength and position of the subtropical high-pressure ridge, which controls clear skies and subsidence warming, while local factors such as urban heat-island effects and variable sea-breeze timing can shift afternoon peaks by 1–3°C. Recent runs indicate potential for 36–37°C under drier conditions, yet increasing model disagreement on any weak frontal or convective activity keeps the 35°C outcome narrowly ahead at 22.9% implied probability. Taiwan’s Central Weather Administration forecast updates and higher-resolution guidance expected in the next 48 hours will likely narrow the range before resolution on verified station observations.