If you've been putting off the spring cleaning or a visit to the art gallery or museum, this weekend might be the time to do it.

A low pressure trough and an offshore low are directing showers and cool air over much of south-eastern Australia and will probably deliver Sydney's coldest November weekend in 11 years, Tom Hough, a meteorologist with Weatherzone, said.

Storm clouds loom over Bondi Beach at the start of an unusually cool weekend. Credit:Fiona Morris

The mercury struggled to break above 17 degrees for Sydney, and across the basin, throughout Saturday. That's shy of the 19-degree maximum forecast by the Bureau of Meteorology, which also tipped about 1-3 millimetres of rain.

Sunday is looking just as miserable as Saturday, with a temperature range of just 15-19 degrees across the 24 hours. Another 3-6 mm of rain is expected.