Recent forecasts from the Japan Meteorological Agency and other models indicate a cloudy pattern with scattered showers and northeasterly winds for Tokyo on August 29, limiting daytime heating and pointing to a maximum near 27–29 °C. This follows several hotter days with clearer skies and supports the market’s close clustering around 27 °C (31.5 %) and 28 °C (27.5 %). Key variables include cloud cover reducing insolation, precipitation timing and intensity that can further cap peaks, and the strength of onshore flow advecting cooler marine air. Model consensus shows low odds for extremes above 30 °C or below 25 °C given the expected conditions, though small forecast shifts in shower coverage could still alter the daily high within the narrow 26–29 °C range favored by traders.