The 35-year-old former Warwickshire and Derbyshire right-armer has taken 401 wickets in 138 first-class matches.

He helped Somerset reach the One-Day Cup final at Lord's in May, although he did not play in the historic win against Hampshire.

"He is a reliable bowler who will add significant experience," said Kent director of cricket Paul Downton.

South African Groenewald, who holds a British passport, will compete in all formats for Kent.

"To be a competitive side, you need depth, and as we seek to move up the Championship table and challenge in white-ball competition, Tim will be a great addition to the group," Downton said.