Classes at morning and all-day schools were canceled after the Hong Kong Observatory put out a red rainstorm warning Tuesday.
The warning was first issued at 7:35 a.m but was replaced by the amber rainstorm warning at 9:35 a.m.
As heavy rain continued to hit the city, the warning was changed back to red at 11.20 a.m.
The Observatory said more than 100 millimeters of rain fell in Sha Tin and Tai Po.
Gusts of wind of 80 km/h were recorded in Lau Fau Shan.
Residents in the northern New Territories were advised to take precautions against flooding.
The Hong Kong Examination and Assessment Authority said international and professional exams scheduled for Tuesday would be held as normal, provided the black rainstorm warning was not issued.
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