Recent Central Weather Administration forecasts and ensemble model runs point to a Taipei high of 29–30°C on September 15 under increasing northeasterly flow, thick cloud cover, and scattered showers that limit solar heating and enhance evaporative cooling. These conditions contrast with clearer, warmer days earlier in the week and align with climatological September norms near 30°C when monsoon influences strengthen. Market-implied odds cluster tightly around 29–31°C because small shifts in precipitation timing or boundary-layer moisture could alter the peak by 1–2°C, while longer-range guidance shows modest spread across global models. Updated CWA briefings and afternoon model cycles over the next 48 hours will provide the clearest resolution signals before the daily maximum is recorded.