Official forecasts from Taiwan's Central Weather Administration project daytime highs of 34–35°C for Taipei on August 21 amid typical late-summer subtropical high pressure, strong solar insolation, and elevated humidity that restricts nocturnal cooling. Afternoon convective showers or thunderstorms, common in the region, introduce uncertainty by enhancing cloud cover and evaporative cooling, which can suppress peak temperatures by 1–2°C depending on timing and coverage. Recent model consensus shows minimal day-to-day shifts, with historical August baselines near 33°C providing context for the tight clustering of trader-implied probabilities around 33–35°C. Updated CWA briefings and ensemble runs over the next 48 hours will refine steering patterns and instability indices ahead of market resolution.