National water agency PUB said in a Facebook post that there were flash floods around 3pm in Upper Paya Lebar Road, Lorong Gambir and Mount Vernon Road.
It had advised people to avoid these and eight other locations, including MacPherson Road, Balestier Road and Sims Drive, as water levels and canals rose to 90 per cent due to the rain.
In an update at 4.15pm, it said the floods, which lasted about half an hour, had subsided, and officers were deployed to render assistance.
A tree also fell in MacPherson Road towards Paya Lebar, causing it to be unpassable.
PUB also said that more heavy rain is expected over many northern and western areas of Singapore in later parts of the evening.
Meanwhile, Singapore shares closed 0.8 percent higher on Monday, as investors awaited the outcome of the U.S. presidential election and a Federal Reserve's policy decision this week.
US markets fell last week as skittish investors braced for one of the most divided and contentious U.S. polls this Tuesday, with fears that an inconclusive result could trigger financial turmoil and even civil unrest. The Federal Reserve will deliver a policy decision Thursday (Nov 5) before the October jobs report Friday.
MayBank-Kim Eng Retail Research said "technically, the Straits Times Index has sliced through its support at 2,450 points with further downside seen at the 2,380 points level."
Singapore's benchmark Straits Times Index rose 19.29 points to 2,443.13 points. Trading volume was 1.21 billion shares worth 1.14 billion Singapore dollars. Decliners outnumbered advancers 236 to 192. - The Straits Times/Asian News Network
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