Parts of Canberra recorded up to 30mm and 50mm of rain on Thursday, as the downpour pushed the territory into its wettest November on record.
The ACT has hit 147.8mm of rainfall for the month of November, breaking the previous record of 138.2mm set in 1995.
The recorded rainfall totals date back to 1939.
Bureau of Meteorology managing meteorologist for NSW/ACT Agata Imielska said Friday would be a "key day where we're going to see more rainfall".
"That November rainfall total is still likely to increase," she said.
The bureau is forecasting up to 45mm on Friday.
Flooding in Queanbeyan
BOM has warned of minor flooding along the Queanbeyan river, which is likely to reach the minor flood level of 4.40m at Queens Bridge at about 11am.
Minor flood is also likely to develop along the Molongolo River at Oaks Estate, which was expected to reach the minor flood level of 4.50m at 11am.
Queanbeyan council workers were on site at the bridge on Morriset Street to monitor the rising water.
A council worker said the flooding was caused by overflow from Googong Dam.
The bridge was closed to traffic but a worker would remain on each side to ensure no passage.
Jack Emanuel, one of the workers stationed at the bridge, was concerned about parents potentially bringing kids down to swim in the overflowing water.
He expected flood waters to at least cover the bridge on Friday.
Sue-Anne Mackinnon had come down to watch the rising water before work.
"I'm just worrying that it might rise up more," Ms Mackinnon, who has experienced worse floods in the area before.
One bystander said she lived outside of Bungendore and had struggled to get over the creek to leave on Friday morning.
"I barely got over the creek that you have to get through to get out of there this morning, I came to get supplies."
"So when I turned right at the roundabout I went, 'Holy shit!'," she said of the bridge closure and rising water.
"I've lived in the region for 30 years but I've never actually been in the region when it was flooding like this.
"I just love the power of it you know, we live in our little civilised bubble with concrete and tar and combustion engines, we've got push-button heating in our homes, and it's always I think just a really good thing to see nature win."
Wet weather continues into the weekend
Showers will continue into the weekend but ease off.
Both days should bring "more of a chance of a shower as opposed to rain", with the current Saturday forecast projecting just a millimetre of rain.
"Even if we see something its likely to be relatively light," Ms Imielska said.
Rain will continue into next week as well, as the record margin is expected to widen.
"We do have that flood risk for this season," she said.
The ACT Emergency Services Agency said it had received more than 100 requests for assistance since 9am on Thursday.
Firefighters, SES and Transport Canberra City Services have been responding to reports of leaking roofs, fallen trees and localised flooding, caused by high soil moisture content leading to overloading of stormwater systems and overland flooding.
ESA reminded the community never to drive, walk, or ride through floodwaters.
Meanwhile, a low pressure system that brought heavy rains and damaging winds to southern and western NSW is expected to push further east.
Feeling soggy? That's November 2021 in #Canberra - #wettest on record with 148mm so far. This is the most rain recorded for any November going back to 1939, breaking the previous record of 138.2mm set in November 1995. pic.twitter.com/N73myays3i— Bureau of Meteorology Australian Capital Territory (@BOM_ACT) November 25, 2021
NSW has seen widespread flooding across the state after extensive heavy rain in areas where the ground is already saturated and rivers already high in many areas and flooding in others.
Australia is on track for its wettest spring in a decade and some regions in NSW have already received more than three times their normal rainfall for November.
A portable rain station south of Griffith measured 60mm in an hour on Thursday.
Snowball, south east of Canberra, recorded 28mm in an hour and Braidwood recorded 15mm in 30 minutes.
Gunnedah recorded more than 20mm in 90 minutes and a similar amount fell at Gunnedah over a two hour period.
Grafton recorded 20mm in three hours, Cabramurra saw 26mm fall over four hours.
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