Forecast models from the China Meteorological Administration and global ensembles like ECMWF and GFS currently converge on a maximum of 27–28°C in Guangzhou tomorrow, driven by a mix of subtropical ridge influence and increasing cloud cover that limits peak solar heating. This setup contrasts with May’s climatological average high near 30°C, where clearer skies often allow stronger diurnal warming. Recent surface observations from Baiyun International Airport show overnight lows around 24°C and morning dew points that favor scattered showers, introducing uncertainty in how much afternoon heating materializes. Traders are assigning nearly equal implied probability to 27°C and 28°C because small differences in cloud timing or localized rainfall could shift the official reading by one degree. Updated model runs and the final 24-hour forecast briefing tonight will be the key catalysts for any last-minute sentiment shift before resolution.