Classes at AM and whole-day schools were cancelled again on Monday as the Observatory hoisted the red rainstorm signal at 1.15am.

Rainfall over the 24-hour period
Rainfall over the 24-hour period leading up to 8:30am on Monday, August 18, 2025. Chart: Observatory.

Intense thundery showers affected the vicinity of the Pearl River Estuary overnight, with Tuen Mun receiving over 100mm of rainfall.

However, all rainstorm signals had been cancelled by 7:20am, meaning classes at PM schools will proceed. The thunderstorm and monsoon signal remained in force as of 8:50am Monday.

“Schools should implement contingency plans and arrange staff to look after students who might arrive and ensure that conditions are safe before allowing students to return home,” a government press release issued at 5:30am said.

Observatory webcam
Sai Kung Marine East Station looking towards the northeast at 8:40am on Monday, August 18, 2025. Photo: Observatory webcam.

The Observatory urged residents to remain alert as the tropical cyclone moves across Beibu Wan: “[U]nder the combined effect of the ridge of high pressure over southeastern China and the tropical cyclone, it will be windy with heavy showers and squally thunderstorms over the coast of southern China and the northern part of the South China Sea.”

“An anticyclone aloft is expected to strengthen slightly in the latter part of this week, the weather will improve over the coast of southern China. It will be very hot during the day,” it added.

Updates from the Observatory:

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Tom founded Hong Kong Free Press in 2015 as the city's first crowdfunded newspaper. He has a BA in Communications and New Media from Leeds University and an MA in Journalism from the University of Hong Kong. He previously founded an NGO advocating for domestic worker rights, and has contributed to the BBC, Deutsche Welle, Al-Jazeera and others.

Tom leads HKFP – raising funds, managing the team and navigating risk – whilst regularly speaking on press freedom, ethics and media funding at industry events, schools and conferences around the world.