The closely matched probabilities around 31–33°C reflect short-range forecast uncertainty for Tokyo’s peak temperature on July 25, with ensemble guidance from agencies such as the Japan Meteorological Agency showing modest spread in afternoon maximums. Key differentiating factors include the strength and position of the North Pacific subtropical high, which modulates southerly flow and moisture advection, alongside urban heat-island amplification from Tokyo’s dense built environment that can add 1–2°C locally. Recent model runs indicate potential for scattered afternoon convection that could cap temperatures near 31°C or allow brief clearing to push readings to 33°C, while climatological July averages near 30–31°C provide the baseline against which current anomalies are assessed. Updated high-resolution runs and observations over the next 48 hours will refine these thresholds ahead of market resolution.