**Current forecasts from major models point to a July 1 daytime high in Guangzhou of 33–34 °C under typical early-July subtropical monsoon conditions, with scattered thundershowers and high humidity limiting extreme heating.** This keeps the 34 °C and 35 °C bins as slight market leaders while leaving room for the 37 °C+ outcome if afternoon convection is suppressed or insolation strengthens. Guangzhou’s July climatology features average highs near 32 °C, with 34–35 °C common on clearer days and brief spikes above 36 °C possible when steering patterns reduce cloud cover. Official guidance (Met Office, BBC, Trip.com) currently converges on 33–34 °C with light rain or thundershowers, which tends to cap the daily maximum through evaporative cooling and reduced solar input. Uncertainty in the 2–3-day forecast window—driven by variable monsoon moisture, exact timing of convective cells, and small differences among global models—explains why 37 °C+ still commands nearly one-quarter of the probability. Traders are effectively pricing the narrow but non-negligible chance that drier or sunnier conditions allow temperatures to reach the upper end of the historical envelope. New model runs and updated China Meteorological Administration guidance over the next 48 hours will be the key catalysts for any sharp repricing.