The 29-year-old has agreed an initial deal to remain at Firhill for the rest of the season, with Lemi having been a free agent following his release by Wasps.
Lemi, who first moved to Britain to play for Bristol, will offset the loss DTH van der Merwe - with the Canadian having been ruled out with a serious shoulder injury.
"I'm delighted to have signed for Glasgow Warriors and to have the chance to help the team enjoy a successful season," said Lemi.
"One look at the squad list tells you that this is a club with a lot of talented players, and I'm confident that I can bring the benefit of my own experience to bear and play a part in the side continuing to win.
"Having spoken to Sean Lineen, I've already got a got insight into the passion and commitment that I'll find at the club. They've been doing well of late, and I can't wait to do my bit to make sure that run continues."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.