Dozens of people of all ages took to the fairly warm water for the annual one-mile Great River Swim from Chiswick Eyot to Chiswick Pier.
With little rain and lack of river water to counteract the incoming tide, the first few hundred metres were hard work with swimmers pushing forward with their best strokes.
It was Jacob Gloor, of Hillingdon Triathletes, who won the race by almost one minute, crossing the finishing line in 30mins 11s.
Runners-up were Richard Royal, of West London Penguin Swimming, with a timing of 31mins 9s, and Christopher Mears, from Tulse Hill, recording a time of 32mins 41s.
The first woman home was Poppy Lenton, of Serpentine Swimming Club, coming home at 35mins 9s.
She was followed by Nicola Murray-Smith, of Park Swim Club, and Anna Bardos also of Serpentine.
The shorter kilometre race was dominated by husband and wife John and Sarah Wren, of West London Penguins.
Several rescue teams were on standby but gladly everyone made it around the course without any major problems.
The event was sponsored by The Black Lion pub down by the river in Hammersmith.
The next river race will be the Totally Thames Swim from Hammersmith to Chiswick, due to be held on September 3.