Recent forecast guidance from agencies including the Hong Kong Observatory points to a daily maximum near 33–35 °C in Guangzhou on August 13 under persistent cloud cover and scattered thunderstorms that limit surface heating. These conditions create the main spread across leading market outcomes, as the precise timing and coverage of rain determine whether peak readings reach 34 °C or stay capped at 33 °C. High humidity and urban heat effects can add 1–2 °C locally, while model consensus on steering patterns and convective timing introduces measurable uncertainty reflected in the tight clustering between 33 °C and 35 °C. Updated official observations and any late-day clearing will refine resolution.