The Observatory issued the red rainstorm warning at 5.05am on Thursday as heavy rain battered the city.
Classes of all AM schools and whole-day schools were suspended.
The Drainage Services Department asked members of the public to report any street flooding.
The Labour Department said employers should make work arrangements for their employees as soon as possible.
The red rainstorm warning lasted till 9.20am when it was replaced by the amber warning.
Authorities said classes of PM schools will proceed as usual unless advised otherwise.
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Last updated: 2026-08-27 HKT 11:17