Storm season to hit NSW early as residents warned to prepare this week

Storm season has come early to New South Wales, and residents have been warned to prepare.

The SES said while the season was meant to officially start on Friday, a trough approaching western NSW today would generate "unsettled weather" during the rest of the week.

It's likely to spark the state's first significant storm outbreak since last season.

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The SES warned storm warnings were likely to be issued from tomorrow, with risks of damaging wings, heavy rains, and hail.

Wet weather is set to reach Sydney on Thursday, before conditions ease on the weekend.

NSW residents are urged to prepare their properties ahead of time, including moving their vehicles undercover and away from trees, and by securing loose items.

The SES' rescue efforts this season are set to be bolstered by $4.6 million in prototype rescue vehicles, including six "Unimogs".

The Unimogs can operate in floodwaters of up to 1.2 metres, circumstances which the SES had previously had to handball to the ADF.

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NSW SES Commissioner Carlene York said SES volunteers are ready and willing to respond when called upon, but communities need to be equally prepared.

"This includes having an emergency kit ready and knowing what your evacuation plan is. We urge every household to discuss their risk and visit the SES website to find a range of valuable resources to help you prepare," Commissioner York said.

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NSW Emergency Services Minister David Elliott said now was not the time for people to be "complacent".

"Communities need to know their local risk, and be ready for the very real possibility of a repeat of recent flooding events, or potentially worse," he said.

People can stay up to date with storm warnings at the Bureau of Meteorology website.

In an emergency, call Triple Zero (000).