**Current forecasts from the Japan Meteorological Agency and supporting models indicate a minimum temperature in Tokyo of 22–24°C on August 13, 2026, under cloudy skies with scattered showers.** These conditions limit overnight radiative cooling compared with clear nights, keeping lows near or slightly below the long-term August average of roughly 24–25°C. The urban heat island effect in central Tokyo further anchors nighttime readings in this range, while elevated humidity sustains warmth. Trader consensus, reflected in the 56.5% implied probability for 24°C and 31.5% for 23°C, aligns closely with the latest JMA guidance of a 23°C minimum. Lower probabilities assigned to 22°C or below reflect the limited cooling potential from forecast cloud cover and showers, which reduce the chance of sharper drops. No significant synoptic shifts, such as a stronger cold front or typhoon influence, appear in the short-range outlook to alter this baseline. Updated model runs or the next JMA briefing could refine these odds if precipitation timing or wind patterns change.