Traffic was stopped for more than an hour after a tree fell onto Old Northern Road in Glenorie.
Motorists were left waiting for more than an hour after a tree toppled onto a road in Glenorie following heavy rainfall this afternoon.
The tree fell at about 3pm and left motorists stranded while it was removed.
The Bureau of Meteorology issued a flood watch for minor to moderate flooding on the Hawkesbury and Nepean rivers following the report of over 30.6 millimetres of rainfall.
An average of 36 millimetres has fallen over the Warragamba catchment since 9am Thursday with rain rates easing over the Warragamba Dam catchment.
Parts of Sydney were drenched in nearly 50 millimetres of rain overnight, with the downpour expected to continue on the weekend.
Earlier today, Weatherzone meteorologist Rob Sharpe said conditions were forecast to improve in Sydney on Saturday, when thousands of revellers will head into the city for the gay and lesbian mardi gras.
"It's looking like it's going to be a fairly cloudy day, and there's going to be a few showers coming through [on Saturday]," Mr Sharpe said.
"At the moment the rain is going to be off rather than on. Most of the day will be dry but there are going to be a few showers coming through."
Mr Sharpe said this summer was the wettest in five years, with 348.8 millimetres of rain falling - more than 50 millimetres above the summer average. Most of that rain fell in the last 33 days of summer.
But this summer was also notable in that Sydney experienced its hottest ever day on January 18, when the mercury topped 45.8 at Sydney's Observatory Hill. That broke the previous record set in 1939 by half a degree.
Sydney also recorded its driest December in eight years.
Mr Sharpe said a low-pressure trough was moving through NSW on Friday morning.
A high pressure system was also centred to the west of Tasmania, extending a ridge along the southern coast of New South Wales.
In Sydney on Friday, the rain is expected to ease in the early afternoon, however winds are expected to average 30-50km/h, with gusts of up to 70km/h.
A maximum of 21 degrees was forecast in the city on Friday, with a top of 23 degrees on Saturday and 25 on Sunday.