More than 30mm of rain had fallen by 10am on Saturday, with a total of 43.6mm of rain since the dreary weather began on Friday evening.

Queanbeyan SES have received 13 requests for assistance since 6pm on Friday and had completed 8 per cent of those jobs on Saturday morning.

There were four teams in the field and flood techs on standby.

Most of the jobs were for leaking roofs, one for property protection from water, and another for fallen branches.

A flood watch remains in place for Queanbeyan and Molonglo Rivers.

Queanbeyan-Palerang Regional Council has closed all sports grounds in Queanbeyan and also the new dog park in Googong, Barkley Park.

The ACT State Emergency Service (ACTSES) has received 23 calls for assistance since 5pm on Friday, mostly relating to backyard and garage flooding as well as leaking roofs. No injuries or serious damage has been reported.

The ACTSES has advised people not to climb onto roofs to remove leaf litter in the wet conditions.

Angle Crossing is closed due to the wet weather, as is the McCulloch Street Underpass in Curtin.

Warnings from the Bureau of Meteorology said a tropical, warm and humid airmass over New South Wales would interact with a complex low pressure system moving through Saturday.

A severe weather warning is in place for heavy rain which may lead to flash flooding in the ACT and Queanbeyan. Including rainfall already received, 48-hour totals are likely to exceed 100mm with localised falls in excess of 200mm in some parts of NSW.

Locations which may be affected include Canberra, Cooma and Yass, while the warning also extends to Condoblin, Wagga Wagga, Albury, Young, West Wyalong, Tumbarumba, Deniliquin, Griffith and Narrandera.

A flood watch is in place for Southern and Central Western NSW.

Damaging winds averaging 80 to 90km/h with peak gusts in excess of 110km/h are possible over the Alpine peaks above 1900 metres.

Director of Roads ACT Ken Marshall reminded road users to exercise caution when travelling.

"If a high level of rainfall occurs, it is possible a number of rural roads could be affected, along with some unsealed reserve and forestry roads, such as fire trails," Mr Marshall said.

"For your own safety, please obey all directions from traffic management staff and signage.

"Motorists should drive to conditions. Do not attempt to cross a flooded road, bridge or causeway and if driving becomes too difficult pull over safely to the side of the road and wait until conditions improve."