Recent ensemble forecasts from the China Meteorological Administration and global models indicate peak temperatures in Guangzhou on June 15 most likely near 30°C, driven by subtropical high pressure, persistent cloud cover, and high humidity in the Pearl River Delta that limit diurnal heating. June climatology supports average highs around 31°C with frequent afternoon convection that can cap maxima, creating the tight clustering of market-implied odds between 28–31°C. Traders weigh minor model differences in timing of any showers or breaks in cloud, which could shift the daily maximum by 1–2°C, while the low probability assigned to 32°C or higher reflects limited potential for strong insolation under current conditions. Updated short-range guidance expected overnight will likely refine these ranges ahead of resolution.