The search for a fisherman who was swept off the rocks at a popular fishing spot on the New South Wales South Coast has been suspended for today but will resume in the morning.

NSW Marine rescue has spent the day searching up and down the coast in an effort to find the man, who is believed to be in his 70s.

Emergency services went to the Kiama blowhole, about half an hour south of Wollongong, after the man "failed to resurface" at about 6.45pm yesterday.

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"Marine Rescue NSW vessels Shellharbour 30 and Port Kembla 31 have been stood down for the day as part of the multi-agency search for a missing fisherman off Kiama," Marine Rescue NSW said in a statement.

"Both vessels conducted parallel line tracking off the coast of Kiama from 8:30am until 3pm today."

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Emergency services worked together to search for the man last night, with a helicopter also scanning the coast.

The search will resume at 8am on Thursday morning.

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