The Loch Lomond Lifeboat said it was called to a report of a family being ‘carried away’ from their tent at the north end of the loch shortly after midnight on Sunday.
The crew attended the scene and found the family in Ardleish on the east bank.
They took them to Ardlui Marina and handed them over to the Scottish Ambulance Service to be checked.
The boat then rescued two other campers who were in the same situation.
The coastguard said coastguard teams from Greenock, Helensburgh and Inveraray also attended the scene, while police and the Scottish Fire and Rescue Service were also alerted.
Photos posted by the Greenock Coastguard Rescue Team on Facebook showed two tents partially submerged in water.
The teams said: ‘At 12.40am this morning the Greenock Coastguard Rescue Team was tasked alongside Helensburgh, Inveraray and two senior officers with several incidents on the north side of the Loch Lomond after torrential rain and thunderstorms affected people camping at various sites near the river. Falloch and assistance required.
“The Loch Lomond Lifeboat rescued two children and four adults from a camp near Ardleish to rescue them to Coastguard, Scottish Ambulance Service and Fire and Rescue Service staff Scottish.
‘Additional assistance was provided by Coastguard staff at other camps north of Loch Lomond.’