Partially coated in sand, Mendes kept it simple, wearing black swim shorts, while his friends went for a more covered-up look.
Mendes' day out at the beach comes just weeks after the 23-year-old singer-songwriter.
"This breaks my heart to have to say this, but unfortunately I’m going to have to postpone the next three weeks of shows through Uncasville, CT until further notice.
I’ve been touring since I was 15 and to be honest it’s always been difficult to be on the road away from friends and family,
Portland i was smiling so much i thought my cheeks were gunna pop," he wrote on Instagram. "Thank you for having us.