Recent cold air advection into southern China has driven cooling across Guangzhou, with northerly winds and increased cloud cover limiting daytime heating ahead of October 5. Official forecasts from multiple models indicate a daily maximum near 28–30 °C under partly to mostly cloudy skies, consistent with trader consensus favoring 28 °C or 29 °C. This reflects a 3–5 °C drop from early-month peaks as the cold air mass stabilizes, reducing humidity and suppressing strong insolation. Key variables differentiating the leading outcomes include exact cloud fraction, wind speed modulating boundary-layer mixing, and any last-minute model shifts in frontal timing. Updated runs from major agencies over the next 48 hours will likely tighten the range before resolution.