The north shore suburb of St Ives is Sydney's most storm-affected suburb.

The NRMA Insurance ranking of Sydney's 10 most storm-affected suburbs was revealed on Monday, as Premier Mike Baird and representatives from the State Emergency Services and the NRMA came together to urge NSW to prepare for another busy storm season.

"Across a range of fronts, whether it be bushfires or storms, the expectation is that we're in for a pretty difficult season, so we're very clearly trying to advise the community to do all they can to be prepared for all types of events," Mr Baird said.

Under looming grey clouds, the warning was well-timed, coming hours after two thunderstorm warnings had been issued for Monday afternoon.