Canberrans still wringing themselves out from the wettest June on record shouldn't put away their gumboots just yet.

A severe storm is expected to narrowly miss Canberra on Monday afternoon.

Sydneysiders look set for a soggy commute to end the working week, as an intense low pressure system off the coast delivers widespread showers, wind and large and powerful surf conditions to the city.

Growing winds and driving rain from Hurricane Hermine lashed Florida's northern Gulf Coast on Friday as forecasters warned of "life-threatening" floods.

The trough that brought a series of storms to Canberra on Saturday is expected to affect the region until Monday.