Toby Lambert from Alton Sports, which sells sports goods such as trainers and clothes, is one of the traders affected by the cancellation.
“It was a huge amount of preparation from the whole team here really getting everything ready for the for the weekend,” he said.
“Disappointing, but weather can’t be helped, really.”
The race organisers said they would be in touch with all participants next week with more details about how to roll their entries over into next year’s event, or claim a refund.
Next year’s Great South Run is scheduled to take place on 19 October.
