The volunteer crew had launched at 3.40pm to reports of a 24ft angling boat in difficulty at the entrance to the Foyle Estuary.
Weather conditions at the time were near gale-force with winds gusting from the west, which made the rescue challenging.
On arriving at the scene, the lifeboat crew established a tow line with the fishing vessel at around 4.27pm and proceeded at a slow speed back to Portrush Harbour in Co Antrim where it arrived about an hour later.
In the extreme weather conditions, the lifeboat temporarily went aground while assisting the casualty vessel to reach the pontoon.
As a safety precaution, the all-weather lifeboat was taken off service to allow a full inspection take place today. Portrush RNLI’s inshore lifeboat remains on service.
The volunteer lifeboat crew acknowledged the help given by local fisherman Richard Connor and the local coastguard team in assisting the lifeboat to get onto the pontoon.
Both the lifeboat crew and the crew of the angling boat were unharmed.
However, it’s understood that a member of the coastguard sustained a hand injury in helping at the scene. Portrush RNLI sends him their best wishes for a full recovery.