Recent model consensus from the China Meteorological Administration and global ensembles points to a daily maximum near 29–30 °C for Guangzhou on May 18, driven by persistent southerly flow under a subtropical ridge and modest daytime heating. Patchy rain and increased cloud cover expected during peak heating hours are likely to cap temperatures just below the seasonal average of 29–31 °C, keeping the 29 °C bin as the narrow leader while leaving 28 °C and 30 °C within striking distance. Historical May observations show a broad distribution around this range, with convective timing and local humidity often shifting the final high by 1–2 °C. Traders are watching the next updated forecast runs and morning satellite imagery for any shift in cloud or precipitation timing that could tip resolution toward one of these closely matched outcomes.