The Tuggeranong area had received the worst of the rainfall, with 57.2 millimetres falling by 4.30pm on Friday, as light rain continued throughout the day.

A severe weather warning had been issued for Canberra on Thursday afternoon, but it was lifted by the Bureau of Meterology at 4.16am on Friday.

There were at least 11 car accidents in Canberra from 10.45pm on Thursday, including a four-car collision on the Barton Highway. The accident occurred at about 11am near the Jeir Bridge, 10 kilometres south of Murrumbateman.

NSW emergency services reported one vehicle was turned on its side and an occupant was trapped and injured.

A NSW Police spokeswoman said one motorist was being treated for suspected broken bones.

The ACT State Emergency Service said it had received 43 calls for help since 7am on Friday, mostly due to minor damage from leaking roofs and minor flooding across a large area of the ACT.

The SES said there were also a number of trees and branches which had fallen across roads across Canberra following the rainfall.

One property in Kambah was also damaged when it was struck by part of a falling tree.

Weatherzone meterologist Kim Westcott said Canberra was well on its way to reaching its April average of 45 millimetres just four days into the month. She said there could be further rain or thunderstorms over Friday and heading into Saturday, although it was difficult to forecast.

"Saturday could be a little miserable in Canberra although conditions should improve by Sunday once the low pressure system begins to move north," she said.

The rain should ease on Saturday before clearing largely by Sunday, with temperatures returning to the low 20s.

The deluge closed dams, reserves and roads and Canberra sport was thrown into chaos. The ACT government was forced to close every ground under its control in the city this weekend. Capital Football is one of the most affected organisations, while rugby union, Australian rules football and baseball are among those also called off.

Organisers also cancelled the Mont 24-hour mountain bike race. The event, the largest of its type in Australia, is based in the East Kowen Forest near Queanbeyan.