Recent Japan Meteorological Agency forecasts and ensemble models indicate a mostly cloudy August 21 with scattered showers or thunderstorms possible, supporting highs near 30–32 °C in Tokyo. Persistent cloud cover and elevated humidity tied to the strengthened Pacific high are expected to moderate peak solar heating, keeping readings close to seasonal normals around 31 °C while reducing the likelihood of 33 °C or higher. Model consensus shows limited day-to-day variability in steering patterns, with any brief clearing the main variable that could push temperatures toward 32 °C. Traders therefore assign the narrowest spread to the 30–31 °C outcomes, reflecting uncertainty in exact precipitation timing and intensity over the next 48 hours.