The bespoke A5 issue will include a summer events calendar featuring European and world music and arts festivals, club nights, sports and travel tips and will be published across 24 pages and include a four-page cover wrap advertising Red Bull's mini shots.
The print run will be 300,000 copies and will be distributed nationwide.
Grant Woodthorpe, executive director of sales and commercial development at Metro, said: "This pocket-size edition will provide the ultimate guide to summer, from boutique hotels and eating out to music festivals that are off the beaten track, as well as the must-have gadgets to keep you a few steps ahead this summer.
"It's a product we know our readers will utilise and one that we are very proud of and demonstrates the creativity of our advertising solutions."
In March, Associated appointed Linda Grant, its commercial development director, as the new managing director of Metro, replacing Steve Auckland, who had been promoted to managing director of its sister regional newspaper company Northcliffe Media.