The closely matched market-implied odds around 30–32°C reflect substantial short-term forecast uncertainty for Manila’s peak temperature on August 31 under the prevailing southwest monsoon. Persistent cloud cover, frequent showers or thunderstorms, and moderate-to-strong southwesterly winds from the enhanced Habagat are limiting daytime solar heating and capping extremes, consistent with PAGASA’s outlook for occasional monsoon rains across Luzon. Minor differences among leading outcomes hinge on exact timing and intensity of rainfall, variations in low-level moisture, and subtle model disagreements on afternoon clearing or wind gust strength, which can shift the daily maximum by 1–2°C. Historical August baselines near 31°C provide context, but active monsoon dynamics introduce the primary near-term variability traders are pricing.