Snow and high winds meant the 92 youngsters from two schools in South Lanarkshire and one in Renfrewshire were unable to return home from a trip to an activity centre yesterday.
The P6 and P7 children from Quarter Primary School in Hamilton, Kirktonholme Primary School in East Kilbride and St Mary's Primary School in Paisley, set off on Monday for what was supposed to be a five-day trip to Castle Toward Outdoor Education Centre on the Cowal peninsula.
The 10 and 11-year-olds were due to return home yesterday, but cancelled ferries and poor weather conditions on the roads forced the pupils and teachers to stay at least an extra night at the centre.
All Dunoon ferries were cancelled until 3pm yesterday, and conditions remained dangerous on the roads.
Parents were informed about the enforced delay.
But, it is understood that ferries could also be cancelled today, with further bad weather forecast.
A spokeswoman for South Lanarkshire Council said: "As the ferry is off because of bad weather the children will stay an extra night and come home tomorrow.
"Head teachers from both primary schools are with the group and parents have been kept fully informed."
A spokesman from Renfrewshire Council said: "Ferry sailings from Dunoon to Gourock were suspended on Friday due to high winds and we were advised that there would be no decision on possible resumption until late on Friday afternoon.
"Even if sailings resumed, there would still have been a long bus journey home in difficult weather conditions later on Friday night.
"On that basis, we felt the safest option was to keep the children in the same accommodation they had been in for another night and attempt the return journey today. The school has texted parents and called them to give more information.
"Weather permitting, the youngsters will return home today."