Recent Central Weather Administration forecasts and supporting global models project a daytime high of 33–34°C for Taipei on August 21 under persistent subtropical high pressure, with ample solar heating offset by high humidity and urban heat-island effects. Closely matched market odds around these levels reflect genuine forecast uncertainty from afternoon convective showers or variable cloud cover that can cap peak temperatures by 1–2°C, consistent with historical late-August variability where daily maxima often fluctuate within this narrow band. Traders are watching the next CWA bulletin and updated ECMWF/GFS runs for shifts in steering flow or instability indices that could tip resolution toward either outcome.