That’s where I stayed when I went to the Saints/Pats game a few years back. Probably the first time I was in a fully walkable town, it blew my mind (and was pretty awesome)
Yeah, I was in Portsmouth last July - really cool. After wife and I had a lobster roll on the waterfront (the current in that river is wild!), she walked around for a bit at the shops while I enjoyed a couple of pints and a soccer game. It was the first week of July and probably 72 degrees.
Update: Yes, the current on the Piscataqua River at Portsmouth can hit 12 knots, making it the swiftest on the eastern seaboard and one of the top 10 in the world per this source: