The small group of 15 adults and children, including several who survived the blaze, visited Felpham Sailing Club, on the West Sussex coast, on Saturday and went sailing and played on the beach, the Press Association reported.
The day out was organised by the Play Association, a charity based in Hammersmith and Fulham which usually supports vulnerable children with special needs, after they were contacted by the Grenfell Fire Response Team.
The trip was among a number of efforts, such as a free holiday appeal run on Facebook by Angie Mays from north Devon, to give those affected some respite as many still await rehousing.
Steve Boeje, chief executive of the Play Association, said the group, which included other youngsters from the Sutton and Brent areas in London, were “absolutely chuffed”.
“We’ve been going every year for about seven years and that was probably one of the best days down there,” he said.
“Obviously we had a very deserving group of people from Grenfell. They are living in hotels and some have been moved three times.
“Yesterday they could forget all that.
“Two little boys, aged six and eight, who were obviously serious affected and they just had joy on their faces all day.”
One mother on the trip, Nabila, told Sky News the trip was “amazing”.
She said she and her three children have had to move out of their home near Grenfell as it is unsafe and she was grateful for the time away.
“Breathing the air ... it’s something different,” she said.
“We’re really grateful, we’re so honoured to have this moment of a day and to see them smiling and say ‘it was the best day!’”
It comes after HuffPost UK reported that residents living just metres from the charred shell of the west London tower are still suffering from a range of physical ailments as fears grow about poor air quality in the wake of the devastating fire more than seven weeks ago.
Residents of nearby buildings spoke of breathing problems, nausea and even mini-strokes, which they had suffered since the devastating fire, which is estimated to have killed at least 80 people.