Source: Hong Kong Government special administrative region
After a very dry first half of the year, more significant rainfall eventually returned to Hong Kong in July 2025, mainly due to the passage of the remnant of tropical cyclone Danas in early July and typhoon Wipha in mid-July, as well as showers associated with troughs of low pressure and active southwesterly airstreams during the month. Also, the strike of Wipha necessitated the issuance of the Hurricane Signal No. 10 on July 20. The monthly rainfall was 601.7 millimetres, about 56 per cent above the normal of 385.8 millimetres. However, with the rainfall well below normal in the first half of the year, the accumulated rainfall recorded in the first seven months of the year was only 1 046.1 millimetres, still a deficit of 29 per cent compared to the normal of 1 468.2 millimetres for the same period. The month was also warmer than usual with the monthly mean maximum temperature of 32.4 degrees, 0.8 degrees above the normal and one of the ninth highest on record for July. The monthly mean temperature of 29.5 degrees and monthly mean minimum temperature of 27.4 degrees were 0.6 degrees and 0.5 degrees above their respective normals.
A broad trough of low pressure and upper-air disturbances brought showers and thunderstorms to Hong Kong on the first day of the month. More than 40 millimetres of rainfall were recorded over Lamma Island and the northeastern part of the New Territories. With the establishment of an anticyclone aloft over southern China, apart from isolated showers and thunderstorms, the weather was generally fine and very hot in the following three days.