Weatherzone meteorologist James Casey said 43mm of rain was recorded on Saturday with 6.2mm falling on Friday night and 2.2mm on Sunday afternoon.

"The weekend's weather originated from what was almost a cyclone in northern Western Australia, which fed moisture into a low pressure trough that moved east towards the coast," he said.

"This is a time of year when we do get a lot of rain in Canberra which is something people seem to forget as they think summer is supposed to be dry."

Mr Casey said the wet weekend was not surprising when you looked at the territory's rainfall records.

"The average January rainfall since 1940 is 57.6mm and at the moment we've reached 67mm, so we've already exceeded the average with only five days of rain," he said.

"But the wettest January was back in 1995 when we received 210mm of rail so we would need a few very good rainfall days to meet that record."

An ACT Emergency Services Agency spokesman said the heavy rainfall meant volunteers were busy responding to jobs across the territory.

"The majority of jobs were in response to leaky ceilings with volunteers also tasked to fallen trees blocking roads and pathways," he said.

Mr Casey said the large number of call-outs was "most likely be due to the heavy rainfall and potential for flooding as the winds were not too strong over the weekend".

The heaviest rainfall was recorded in Braidwood which was drenched with 48mm of rain within a 24-hour period and a further 24.8mm on Friday.

Monday and Tuesday are expected to remain dry in Canberra although Mr Casey said at least 10mm of rain would fall on Wednesday with the possibility of 30-40mm.

Sunday was the coldest day of the month at 21 degrees which was seven degrees colder than the monthly average.

"The average temperature for this time of year is 28 degrees and at the beginning of the month we were getting up around the low-to-mid 30s," Mr Casey said.

"So far January has been three degrees warmer than the average because of the warm days earlier in the month."