Last weekend the temperature in Salford Quays was a balmy 18c.
There's a distinct autumn chill in the air today. Over the last few days, texts and emails have been arriving from the organisers to inform swimmers that the water temperature has dropped to 15c and is still falling. So wetsuits are now compulsory for everyone.
This morning we popped down to see how the venue is shaping up. There was a swimming session in Ontario Basin, boats were out surveying the scene, marquees being bundled out of vans.....an air of purposeful preparation.
Up above is the start area - a little pool for adjusting to the cold, and the start enclosure with plenty of space all round for spectators.
And here's the first stretch - Huron Basin up to the bridge, Erie Basin beyond it.
Tomorrow morning final practice - all finished by 9am, then a simple matter of keeping nerves in check till Sunday!