**Tropical Manila's August minimum temperatures are shaped by the southwest monsoon, which delivers persistent cloud cover, high humidity, and frequent showers that limit nighttime radiative cooling.** Official PAGASA forecasts for August 21, 2026, project a daily range of 25–29°C with a 60% rain chance, consistent with historical August averages of 24–26°C lows. These conditions favor market-implied probabilities clustering around 25–28°C, as extensive cloudiness and moisture trap heat and suppress drops below 24°C. No significant cold surges or atypical circulation patterns have emerged recently, keeping the distribution tightly centered on typical monsoon values while assigning negligible odds to extremes below 23°C or above 29°C. Updated model runs and monitoring agency briefings remain the key near-term catalysts.