Holyhead coastguards, an inshore lifeboat and an RAF rescue helicopter helped four kayakers after they capsized off Church Bay at 13:12 BST.
At about the same time, Swansea coastguards said teams rescued two people in capsized dinghies and another three people when a catamaran capsized.
A spokesman urged caution, adding the winds were a 'choppy' force six.
He said two dinghies capsized off Penmaen, which resulted in two people in the water.
Oxwich coastguard rescue team, Mumbles all-weather lifeboat and the Horton inshore lifeboat were scrambled, but the casualties were picked up by a passing vessel and taken to Oxwich Bay safely.
As the teams finished dealing with that incident, they were scrambled to reports of a capsized catamaran off Port Eynon point.
Two adults and a nine-year-old girl were in the water, but again were picked up by a passing vessel.
A Swansea coastguard spokesman said: "They could have been two very nasty incidents.
"It's a bit choppy out there. There are force six winds so we would advise people to stay within the limits of what they are capable of."
The Holyhead incident involved a man and three children, but all were uninjured.
Coastguards are urging people to take care in "choppy" seas after three incidents in the space of an hour.