While the ACT has had only 13mm of rain in the last 48 hours, less than was expected, a low pressure system off the coast of NSW will keep the territory rainy for at least another day.

Weatherzone meterologist Max Gonzalez said from Sunday the system should move north up the coast, taking the rain with it.

"The southerly change will come through overnight, bringing more drizzle and then up to 5mm tomorrow before it starts to dry up on Sunday," he said.

"It'll be mostly dry on Monday."

Canberra has had 56mm of rainfall so far in April, 11mm more than the monthly average.

But although next week will be drier in the ACT, it'll also be a lot colder, with Friday's 20-degree maximum the hottest weather Canberrans will see for a while.

Mr Gonzalez said the main thing Canberrans would notice starting next week would be how cold the weather had become.

"It'll start to cool down, so next week in particularly we'll see some very cold mornings, dipping below 10 degrees and even as low as six degrees," he said.

"Things are definitely turning wintery in the city."

Canberrans who are planning to head down to the coast over the weekend will also be in for a rude shock, with the low pressure system bringing some nasty weather to the area.

"Along the coast there will be very strong winds and very dangerous surf conditions, before easing on Sunday," said Mr Gonzalez.

"[The system] will track north eastwards along the coast of NSW but by Sunday it will be too far away to impact Canberra."