Traders see the highest temperature in Guangzhou on June 25 clustered around 33–36°C because short-range model runs show modest day-to-day variability in cloud cover and afternoon thundershower timing. In the city’s humid subtropical monsoon regime, even brief heavy rain or thicker cloud decks can suppress peak readings by 2–4°C through reduced insolation and evaporative cooling, while clearer intervals allow urban heat-island effects to push values toward 36–37°C. Recent ensemble guidance from regional centers indicates 30–60% probability of measurable precipitation during the afternoon window, keeping the distribution broad rather than favoring any single threshold. Updated model cycles and official observatory guidance expected within the next 24–48 hours will likely tighten the range as steering patterns and moisture profiles become clearer.