Recent developments in the East Asian monsoon system, including a persistent trough of low pressure and variable steering patterns over the South China Sea, have created substantial uncertainty in remaining May rainfall totals for Hong Kong. With roughly half the month elapsed amid mostly dry early conditions, trader consensus clusters tightly around 180–220 mm bands, reflecting model divergence between drier northwest monsoon influences and potential late-month convective bursts. Official Hong Kong Observatory guidance for normal to above-normal seasonal rainfall provides context, yet short-term forecasts highlight sensitivity to exact timing of rainbands and tropical wave activity. Historical May totals average near 300 mm with high year-to-year variability driven by monsoon onset dates, underscoring why no single outcome dominates at present. Updated numerical weather prediction runs and observational data through the final two weeks will likely sharpen resolution.