**Forecast models from multiple sources, including GFS data and agency outlooks, indicate Manila's daily high on September 15 will reach 31°C amid typical monsoon-season conditions of scattered thunderstorms, high humidity near 80-90%, and light winds.** This aligns with September climatology showing average highs of 30-32°C and supports the market's near-100% implied probability for exactly 31°C as the peak. Trader consensus reflects the tight clustering of ensemble predictions and absence of signals for significant deviation. A realistic challenge could arise from prolonged clearing that allows greater solar heating or heavier rainfall suppressing the maximum, though current guidance shows low likelihood of either extreme.