The Hong Kong Observatory recorded just 94.3 mm of rainfall for September 2026 at its official station, well below the 1991–2020 climatological normal of 321.4 mm and firmly inside the <275 mm market bracket. A strong northeast monsoon, limited tropical cyclone influence after early-season systems such as Saudel, and predominantly fine or only lightly showery conditions under high pressure kept monthly totals low across the territory. Official daily extracts confirm the absence of any prolonged heavy-rain episodes, with most days registering trace amounts or zero precipitation. While late-month model revisions or station-specific micro-climate variations could theoretically nudge final verified figures, the multi-station pattern and HKO’s preliminary summary leave little realistic scope for the total to approach normal levels. Traders priced this outcome at near-certainty once the dry pattern became evident in mid-to-late September.