Latest Japan Meteorological Agency guidance forecasts a daytime high of 35°C in Tokyo on August 26, with morning clearing and only modest afternoon shower chances (10–30% probability). This places the outcome near the market’s top two probabilities (34°C at 33.5%, 35°C at 28.5%). Key differentiating factors include model spread on cloud cover and convective timing: stronger insolation under partly sunny skies could push the official station reading to 36°C, while earlier or heavier showers would cap it at 33–34°C. Historical late-August climatology shows Tokyo maxima averaging near 31–32°C, so current guidance reflects above-normal heat with limited steering flow and high boundary-layer moisture. Updated model runs and any revised JMA bulletins issued overnight will be the primary near-term catalysts for shifts in trader sentiment.