**Official forecasts from the Japan Meteorological Agency (JMA), issued August 20, place Tokyo’s maximum temperature on August 22 at 32°C under cloudy conditions with scattered showers.** This aligns with the market’s tight spread between the leading 31°C (34.0%) and 32°C (27.5%) outcomes. Seasonal context supports elevated readings: JMA’s summer outlook projected above-normal temperatures nationwide due to a strengthened Pacific High, consistent with typical late-August climatology where daily maxima average near 30.8°C. Key differentiating factors include the timing and coverage of showers, which can suppress peak heating by increasing cloud cover and evaporative cooling, versus any strengthening subsidence that could allow clearer intervals and higher readings. Tokyo’s urban heat island effect adds roughly 1–2°C to official observations relative to surrounding rural areas, while ensemble model spreads at this short lead time introduce small uncertainties around the exact peak. Traders appear to be balancing the current JMA point forecast of 32°C against the possibility of modest downward revision if showers arrive earlier or prove more widespread than anticipated.