SINGAPORE, March 21 -- A relentless monsoon surge has drenched Singapore since Wednesday, bringing widespread disruptions to businesses, outdoor activities, and travel.

According to The Straits Times (ST), the heavy rainfall, expected to persist until today, has led to flash flood warnings and cancellations across various sectors.

According to the national water agency PUB, rainfall levels in some areas have far exceeded Singapore's average for March.

By 7pm yesterday, Jurong West recorded 318mm of rain, while the highest in the east was 298.4mm - both surpassing the monthly average of 209.7mm. The lowest temperature recorded was 21.9C in Tuas South at around 10am yesterday.

The downpour caused a 15m stretch of Mountbatten Road and Ja...