Forecasts from the China Meteorological Administration point to thunderstorms on August 13, 2026, supporting the tight clustering around 34–36 °C as the leading market-implied outcomes. High humidity, typical of Guangzhou’s subtropical summer, limits daytime heating while steering patterns and convective activity determine whether peak readings reach the upper end of that range. Official guidance lists a 35 °C high with possible showers, consistent with climatological August averages near 32–33 °C but allowing brief excursions higher if cloud cover breaks. Traders weigh these variables against historical daily maxima, noting that even modest shifts in timing of rain or insolation can tip the daily high across the narrow thresholds that separate the top three probabilities.