Recent short-range model guidance from agencies including the China Meteorological Administration points to a daily maximum of 29–31°C in Beijing on August 18, driven by a weakening subtropical ridge and modest moisture return that favors scattered clouds and light showers. These conditions introduce uncertainty between 29°C (possible under earlier or more persistent cloud cover) and 31°C (favored if afternoon insolation strengthens), as urban heat-island effects and boundary-layer mixing can add 1–2°C locally. Late-August climatology shows typical highs near 30°C with a standard deviation of roughly 2°C, so the closely matched market probabilities capture genuine forecast spread rather than a single dominant outcome. Updated runs from global ensembles and the next official briefing will likely narrow the range before resolution.