Japan Meteorological Agency seasonal outlooks project above-normal August temperatures across Honshu due to a strengthened Pacific High, establishing a baseline for Tokyo highs near the long-term normal of 31.8°C. Short-term guidance for August 5 highlights persistent cloud cover that should limit surface heating and convective development, positioning the daily maximum most likely in the 29–31°C range. Urban heat-island effects and high humidity typical of late-summer Kanto conditions add modest upward bias, while any breaks in cloudiness could briefly push readings toward 32°C. Model consensus and recent JMA guidance therefore concentrate trader-implied probabilities around 30–31°C, with lower tails reflecting residual uncertainty in exact insolation and boundary-layer mixing on the target date.