**Trader sentiment for Taipei’s August 15 peak temperature centers on official Central Weather Administration (CWA) guidance pointing to a daytime high of 35–36 °C, with afternoon thundershowers possible.** This produces nearly identical implied probabilities for the two leading outcomes (36 °C at 41 % and 35 °C at 39.5 %). Late-summer subtropical conditions—high solar insolation, weak steering flow, and elevated humidity—support strong daytime heating, while the urban heat-island effect in Taipei amplifies readings at official stations. Recent orange heat alerts and recorded peaks of 36–36.9 °C in adjacent districts on prior days reinforce the upper end of the range. However, forecast uncertainty arises from potential cloud build-up or scattered showers, which can cap the maximum by 1 °C through reduced insolation and evaporative cooling. Model consensus and CWA bulletins therefore cluster tightly around 35–36 °C, explaining why the market prices these two bins so closely while assigning sharply lower odds to 37 °C or above. Updated CWA briefings and afternoon satellite trends on the 15th will be the decisive inputs for resolution.