Current numerical weather models, including those from Taiwan's Central Weather Administration, project a daytime high near 29°C for Taipei on September 21 under mostly clear skies and light northeasterly flow. This setup favors modest diurnal heating over the urban basin, with limited moisture and subsidence limiting cloud development that could otherwise cap temperatures. Trader consensus clusters around 31–32°C because small differences in boundary-layer mixing, urban heat retention, or slight model warm biases in ensemble runs can shift the peak by 1–2°C, while cooler outcomes would require unexpected onshore flow or increased cloud cover. Historical September maxima in Taipei often reach the low 30s under similar patterns, though official observations will resolve the market based on the single highest recorded value.