Recent atmospheric models indicate a transitional high-pressure ridge over northern China will support peak daytime heating near 26–27°C in Beijing on May 18, with modest uncertainty arising from variable afternoon cloud cover and southeasterly winds that could enhance or suppress surface temperatures by 1–2°C. Ensemble guidance from the ECMWF and CMA shows tight clustering around these values, consistent with climatological May maxima near 26°C, while any earlier frontal passage or increased moisture would favor the lower 25°C outcome. Traders appear to price the narrow spread between these scenarios as the primary near-term risk before official China Meteorological Administration observations finalize the daily high.