Dublin Coast Guard tasked Skerries RNLI shortly before 9pm on Sunday evening, having received a 999 call from two people who had been cut off by the tide.
The lifeboat was launched with volunteer Eoin Grimes at the helm and crewed by Paddy Dillon, Emma Wilson and Peter Kennedy.
Making their way directly to Loughshinny Harbour, the lifeboat crew began a search of the immediate area. They spotted the casualty on the rocks using the light on a mobile phone to signal for help.
The casualties were taken on board the lifeboat and dropped back to the harbour, where they were met by volunteers from Skerries Coast Guard unit.
Conditions at the time were moderate with a Force 3 to 4 northerly wind.
Speaking about the callout, Skerries RNLI lifeboat operations manager Niall McGrotty said: “We’d like to remind everyone making the most of the coast in the good weather to always check the tides and forecast for the area and to carry a means of calling for help.”