Recent Japan Meteorological Agency forecasts indicate a high-pressure ridge over the region driving southerly warm advection and strong daytime insolation, positioning Tokyo’s official Otemachi maximum near 28–29 °C on May 17. Ensemble model consensus supports this range, with limited spread in guidance and no significant frontal passages expected to alter the trajectory. Mid-May climatology for Tokyo shows typical highs of 22–24 °C, so these conditions represent a clear positive anomaly sustained by clear skies and light winds that enhance surface heating. Traders assign closely matched probabilities to the 28 °C, 29 °C, and 30 °C-or-higher outcomes because small forecast adjustments in peak afternoon temperatures can easily shift the exact recorded value across these thresholds. Updated model runs tomorrow morning will provide the final resolution inputs.