Recent heavy rainfall and associated cloud cover across Chongqing have driven the tight clustering of market-implied probabilities around 22–23°C for the August 29 overnight low. Official forecasts from the Chongqing Meteorological Observatory highlight a strong precipitation event with 20–80 mm of rain, short bursts of intense downpours, and 6–9 grade gusts, which suppress daytime heating while advecting cooler, moist air masses from the northwest. This setup produces surface temperatures that stabilize near 21–24°C overnight under persistent overcast skies and high humidity, consistent with observed dew points around 23–25°C. Model spread in the precise timing of rain cessation and local topographic effects in the hilly terrain creates the near-even odds between 21°C and 24°C outcomes. Updated guidance expected from the National Meteorological Center overnight will likely resolve remaining uncertainty before final readings.