**Current forecasts from the Japan Meteorological Agency and major models indicate a high of 32–35°C for Tokyo on August 25, 2026, with most guidance clustering around 33–34°C under partly cloudy to mostly sunny conditions.** Southerly flow ahead of a weakening frontal boundary is advecting warm, humid maritime air, while limited cloud cover and light winds allow strong daytime heating. Recent model runs show modest spread driven by small differences in predicted cloud timing and any weak afternoon showers, which could shave 1–2°C off the peak if they develop earlier than expected. The flat 18.5% probabilities across 30–33°C reflect this narrow but unresolved uncertainty band in ensemble guidance, consistent with typical 48-hour forecast variability for maximum temperature in a humid subtropical summer regime. Historical late-August climatology (average high near 30–31°C) places the current setup above normal, supporting the market’s emphasis on the upper-30s range while leaving room for resolution shifts from the next model cycle or updated JMA guidance.