Canberra has seen unseasonably warm nights this week, well above the 6 degree average for this time of year.

Wednesday night saw a minimum of 9.2 degrees while on Thursday night temperatures didn't drop below 14 degrees.

And temperatures have been even warmer right about bed time, possibly explaining why you were tossing and turning about 11pm.

Canberra was still at a balmy 17.3 degrees about 11pm last night, while on Wednesday night it was 16.6 degrees.

Weatherzone meteorologist Tom Hough said the warmer, humid conditions came from a low pressure trough over NSW extending down from the NT and Queensland into NSW, drawing warmer air from the interior.

"Overnight last night humidity was in 80s and 90s and when we had some rain up to 100 per cent humidity," he said.

Mr Hough said there should be cooler conditions from tonight with temperatures returning to about average.

"We'll see some slight warmth back again towards the end of week," he said.