Recent Hong Kong Observatory guidance and ensemble model runs project a daily maximum near 29–31°C for July 21, with scattered showers and variable cloud cover expected to moderate peak heating under typical July monsoon conditions. Subtle differences in timing and extent of rainfall across guidance keep the 29°C, 30°C, and 31°C outcomes tightly bunched in trader pricing, as additional moisture convergence can suppress temperatures by 1–2°C while clearer intervals allow brief spikes toward 32°C. Seasonal signals of normal-to-above-normal warmth provide limited upward bias, but the two-day horizon leaves resolution sensitive to the next official forecast updates and any rapid changes in steering flow.