The first came on Saturday 6 July following a report that three children were drifting offshore on an inflatable toy.
The volunteer lifeboat crew was already afloat on exercise as part of the annual raft race in Kircubbin, Co Down, when they got a call to go to the aid of the three children aged 10, 11 and 14 who were drifting out to sea on the inflatable 18 miles away at Cloughey Bay.
Portaferry RNLI was called out for a second time at 4.10pm to rescue a number of people on board a speedboat that had lost power in Strangford Lough just off Killyleagh.
The crew arrived at the scene at 4.15pm, by which time the 15ft speedboat had already been towed in and was moored at the pontoons at Killyleagh Yacht Club in Strangford Lough.
On both occasions the weather was fine with good visibility and calm seas.
Yesterday (7 July) the volunteer crew launched for the third time to assist an injured woman on Salt Island in Strangford Lough.
The crew arrived at the island at 10.10am and assessed the situation before transporting two paramedics from Killyleagh to the injured woman, who was subsequently airlifted by Irish Coast Guard helicopter to Musgrave Park Hospital in Belfast for treatment.
At 11:35am, while returning to the lifeboat station, the crew was alerted once again, this time to go to the aid of two men onboard a five metre Dory that had lost power and was drifting just off Ringhaddy Sound in Strangford Lough.
The crew arrived on the scene at 12.05pm and took the men onboard the lifeboat, towing the powerless boat into Strangford Lough Yacht Club, where the men were then put ashore and their boat tied up.
Elsewhere in Northern Ireland, Newcastle RNLI assisted two men after their motor cruiser ran aground off the Co Down coast last Thursday (4 July).
The volunteer crew launched their inshore lifeboat at 2.20pm following a report from Belfast Coastguard that a small vessel had ran aground off Dundrum Bar with two people on board.
Weather conditions at the time were described as blowing south westerly four to five winds with moderate to choppy seas. There was good visibility.
The lifeboat, helmed by Nathan Leneghan and with crew members Declan Barry and Charles McClelland on board, arrived on scene at 2.30pm, where they observed that one of the men had made it to shore while the other was still on the 5m boat.
Speaking following the call-out, Newcastle RNLI deputy launching authority Joe McClelland said: "Thankfully, no one was in immediate danger and we were happy to bring the vessel and the man who was still on board safely to shore."