Fine, hot weather is expected to return late this week after severe tropical storm Rumbia moves across the South China Sea and edges closer towards western Guangdong.
Rumbia is due to be closest to the city overnight, the Observatory said.
It did not expect to have to issue higher warnings.
Rumbia is the second tropical storm to sweep through Hong Kong this summer, following Bebinca late last month.
In March, the Observatory predicted that four to seven tropical storms would affect Hong Kong this year.
At midnight, Rumbia was estimated to be about 380 kilometres southwest of Hong Kong and forecast to move northwest at about 22 km/h towards western Guangdong.
Wind speeds of 41 to 62 km/h were expected, the Observatory said.
Rainbands and clouds associated with the storm brought squally showers to the coast of Guangdong, and more than 20mm of rainfall was recorded over parts of the city yesterday afternoon. There were no reports of flooding or injuries.
Kindergartens, as well as schools for children with physical disabilities and schools for children with intellectual disabilities were suspended.