On Saturday, flash flood warnings were issued for 10 locations across Singapore, with the heaviest rainfall of 108.4 mm recorded in northwest Singapore between 2:10 p.m. and 4 p.m.

This amount represents about 43 per cent of Singapore’s average monthly rainfall in November and is within 3 per cent of the maximum daily rainfall records since 1978, the PUB said on Saturday.

In its fortnightly forecast released on Friday, the Singapore Meteorological Department said moderate to heavy thunderstorms are expected almost every day until the end of November due to the northeast monsoon.

The weather service also forecasts that rainfall totals for the two weeks will be “above average” over most areas of the island.

On some rainy days, daily minimum temperatures of around 23 degrees Celsius can be expected, the statement added.