The warning from the Observatory came after a 90 minute amber rainstorm warning was issued for the city soon after noon on Sunday
Hongkongers will have to prepare for plenty more rain later this week as the Hong Kong Observatory expects the city to be hit by showers for at least nine days in a row.
A few thunderstorms and showers are expected to hit the coast of Guangdong today, but the rain is expected to ease off and be followed by sunny periods, according to the forecasters.
The cloudy and wetter conditions, however, will return to the northern part of the South China Sea towards the middle of the week due to a broad trough of low pressure.
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“The area of low pressure to the east of the Philippines may develop gradually, but its movement in the next few days is uncertain,” the Observatory said.
The forecast for more rainy weather comes after the Observatory issued the amber rainstorm warning for the city soon after noon yesterday, and lowered it about 90 minutes later.
The warning, posted at 12.35pm, meant heavy rain of more than 30mm an hour had fallen or was expected to fall generally over Hong Kong.
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A thunderstorm warning and the strong monsoon signal remained in force yesterday.
Some two dozens reports about fallen trees were made to the Hong Kong Police during the heavy downpour. A fallen tree in Sai Kung damaged a vehicle but no one was injured, said the police.
Landslides were spotted in Stanley and Tseung Kwan O.