Traders have converged on 31°C as the near-certain outcome for Shenzhen’s highest temperature on June 12 because official forecasts and climatological normals align precisely with that threshold. June daytime highs in the region typically average 31°C under the influence of the East Asian monsoon, with current model guidance from agencies such as the China Meteorological Administration showing a peak near that value amid humid, partly cloudy conditions and light southwesterly flow. No significant heatwave, cold surge, or tropical disturbance is indicated that would push readings to 32°C or hold them at or below 30°C. Measurement resolution depends on the official station reading, so localized variations or timing of any brief shower could still shift the final value, though the prevailing atmospheric setup makes such deviations unlikely by the close of the day.