Large and powerful surf conditions are expected to batter most of the NSW coast for most of the working week as a low-pressure system that delivered a weekend drenching continues to linger off the state's coast.

The Bureau of Meteorology issued a warning on Monday morning for large and powerful surf conditions from the South Coast to the North Coast for Monday and Tuesday at least, and the conditions are likely to persist until Thursday.

Waves hit the Bondi Icebergs pool at dawn on Monday. Credit:Nick Moir

The high seas - with waves expected to be three metres for much of the week - will make it hazardous for coastal activities such as rock fishing, swimming and surfing, the bureau warned.

Weatherzone senior meteorologist Jacob Cronje said the strong low-pressure system that delivered heavy rainfall across parts of NSW over the weekend continued to linger off the NSW coast.