Since 9am Thursday, Canberra Airport received 20mm of rain.

The ACT State Emergency Service received 55 calls for help from 10.30am to 7pm on Thursday, with a majority of calls coming from the northern suburbs.

Volunteer crews along with crews from ACT Fire & Rescue helped people with leaking roofs, blocked downpipes and drains. The ACTSES advises people to make more permanent repairs as soon as possible.

Dr Helen Kirkup from the Bureau of Meteorology says Canberrans can expect another 20 or 30mm of rain over the next few days.

"We do expect thunderstorms building up this afternoon," she said

"They may not hit Canberra itself but broadly across ACT region, there could be places with heavy rains through these thunderstorms.

"In terms of hail, it's less likely, it's not highly likely that we'll see large hailstones in this system."

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Alongside storms, Canberrans can also expect strong wind gusts today and tomorrow.

This rain system covers the ACT and central NSW.

"There's a fairly deep trough sitting through central NSW. This is aided with a low pressure system that currently is fair way south west into the Australian bite."

"We've got a series of troughs making it very unstable through today and tomorrow, " she said.

Strong winds on Saturday is expected to see the rain clear up.

However Canberrans can expect colder minimum temperatures during next week.

"Saturday night will see the colder front come through and that would bring some fairly strong westerly winds" She said.

"You'll start to see things clearing up after it comes through.

"Once we get past these two two days of this moist storm air mass, it will start to get quite cool."

Friday's forecast is a top of 20 degrees. Saturday's maximum temperature is 18 degrees, with a minimum of 12 degrees, while Sunday is expected to be much colder and drier, with a maximum of 15, a minimum of 5 degrees, and only a 5 per cent chance of rain.