Exclusive Cardiff Bay Open Water Swim
Events / Swim
Cardiff Bay Swim 2025
Cardiff Bay is supplied by two rivers to form a 500-acre (2.0 km2) freshwater lake around the former dockland area south of the City Centre. The 'bay' was formerly tidal, with access to the sea limited to a couple of hours each side of high water but now provides 24-hour access through three locks.
Swimming in the Bay is only allowed when authorised by the Harbour Authority so by taking part in this event you will join an exclusive group of Cardiff Bay swimmers!
This event has been created primarily for triathletes looking to warm up or gain open water experience; however it is open to everyone and with three different distances this event has something for all from first time open water swimmers, to experienced swimmers looking for a challenge over a longer distance.
Choose your distance
Cardiff Bay
750m
21 Jun 2025
Swim: 750m
Cardiff Bay
1900m
21 Jun 2025
Swim: 1900m
Cardiff Bay
3800m
21 Jun 2025
Swim: 3800m
What's Included
Lively Event Village
Music, commentary, shopping, food and chill out zones.
Family Friendly Vibes
Family finishes and plenty to see and do.
Lots of Support
Brilliant marshals, water safety and rescue boats
Slate Finisher Momentos
Locally bought to mark your achievement and provide a lasting, unique and usable momento
Exclusive and Iconic Location
Join an exclusive group of Cardiff Bay swimmers
Professional Timing
Chip timing and online results
Event Information
Cardiff Bay Swim 2025
FAQs
Cardiff Bay Swim 2025
Travel & Accommodation
Cardiff Bay Swim 2025
Info for locals
Cardiff Bay Swim 2025
Volunteer
Cardiff Bay Swim 2025
Gallery
Cardiff Bay Swim 2025
Race Reports
Other Swims
Related Events
We are proud that all our events are bilingual. Signs, registration and commentary are available in English and Welsh.
Event Partners
Working with local communities
Looking after our environment
Find out more about Looking after our environment
Tees for Trees
Find out more about Tees for Trees