Emergency services received close to 480 calls for help in the capital after a hail storm and heavy rain battered the territory.

Intensive care paramedics were called to a home in Richardson after a woman fell off a ladder and broke her arm during the storm.

The 42-year-old was stabilised at the scene and taken to Canberra Hospital in a stable condition.

In a separate incident, an elderly woman sustained suspected spinal damage after a fall in Isabella Plains.

Paramedics also transported her to Canberra Hospital in a stable condition.

Hail damage and small-scale flooding was reported in Tuggeranong although no serious damage was recorded. Firefighters had also reported broken power lines in Curtin and Theodore.

The ACT State Emergency Service has established an incident management team to assist those in need.

Weatherzone meteorologist Kim Westcott said 14 millimetres of rain was recorded in Tuggeranong between 7.30pm and 8pm, with similar reports across Canberra's northern suburbs.

On Monday evening, the Bureau of Meteorology issued a severe thunderstorm warning for the Canberra region warning of damaging winds, large hailstones and flash flooding.

In Tuggeranong, many residents reported power outages and posted pictures and videos of large hail stones falling in their backyards.

The ACT State Emergency Service completed 200 call outs before they were stood down at midnight, with the assistance of firefighters and TAMS crews.

Crews will start responding to the remaining calls at 8.30am on Tuesday morning.

The call outs are mostly for flooding and roof damage, an ACT Emergency Services spokesman said.

Weatherzone: ACT storm tracker

The State Emergency Service has urged people to move their cars away from trees, remove loose items around their homes and to keep clear of creeks and storm drains.

"If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue," a spokesman said.

Ms Westcott said storms were moving across eastern NSW on Monday afternoon, including to the south and west of the ACT

"Heavy rain, damaging winds and hailstones are all possible in Canberra so people should take action and precautionary steps to ensure their cars and belongings are safe," she said.

While expected, the hail and heavy rains caused havoc for those attending the Australia Day celebrations at Parliament House, with Jimmy Barnes taking the stage in gloomy conditions.

Ms Westcott said more rain and thunderstorms were likely in coming days although the forecast was volatile and could change.

"The ACT is a small target but the good thing is the weather will be a little cooler and we won't see any of those stinking hot mid-30 days like earlier in the month," she said.

"This low pressure system will hang around the area for the next few days and there is a possibility of another low pressure system coming up from Victoria.

"I would definitely be hanging onto my umbrella tonight and making sure I have it for the rest of the week too."

According to the Bureau of Meteorology, the Canberra region is likely to see light showers until Saturday with possible thunderstorms on Tuesday, Wednesday and Thursday.

Temperatures are set to remain in the mid-20s throughout the week with up to 8 millimetres of rain forecast on Wednesday and Friday.

- with Katie Burgess