Two people have been rescued after their boat capsized in Lyttelton Harbour near Christchurch this morning.

Emergency services were called at around 9.30am after reports of a boat capsize near Ripapa Island in the harbour.

They were found huddling on rocks, suffering a lot of scrapes and scratches, said Rachel McKenzie of Canterbury Coastguard.

Both were wearing lifejackets and had been well-prepared, she said.