UPDATE: ABOUT 24,000 lightning strikes have been recorded in wild weekend weather in NSW.

The Bureau of Meteorology said the state's highest rainfall was recorded at Coffs Harbour, with 160mm in the 24 hours to 9am (AEDT) yesterday.

Wind gusts of up to 100km/h were also recorded in the state's north.

The NSW State Emergency Service was kept busy, with 150 call outs on Saturday and yesterday, most from the northern NSW township of Woodburn.

Most of the strikes occurred on Saturday in northern NSW, which was hit by a large storm cell, a spokesman from Weatherzone told AAP.

Strikes were also recorded just south of Sydney and on the south coast, where a storm whipped up a massive water spout in the ocean off Batemans Bay.

At least four houses will have to be demolished in Woodburn after a devastating storm hit at about 7pm (AEDT) on Saturday.

The town, located south of Ballina with a population of about 350, was lashed with 100km/h winds and 75mm of rain in 25 minutes.

SES local controller Jim McCormack, who has lived in the Woodburn area for 30 years, said the damage was unprecedented and it was a "miracle" no one had been seriously injured.

"There are at least four homes that will have to be completely demolished, 12 with major roof damage and 12 with minor roof damage," he said.

"In Woodburn and outlying areas, a lot of people have also been trapped in their homes by fallen trees on houses and across driveways."

Though the worst had passed, Mr McCormack said the clean up could take weeks.

A NSW SES spokeswoman said the south coast town of Bermagui had also been affected by storms yesterday, with six call outs.

A Bureau of Meteorology spokesman said there was "nothing exceptional" about forecasts across NSW for the coming week.

However, he said there was a possibility of more storms hitting northern NSW next weekend.