It’s been nearly five years since the last Weakerthans album. There’s no talk of a new one coming out anytime soon. But if John K. Samson’s Wednesday night show is any indication, he’s still in top form and it’ll be worth the wait.

MONDAY >> Tom Kierein tells us that this is our last day of “comfortable humidity,” before that familiar wet hot D.C. summer returns. Seize the day and head to Fort Reno to take in Wooly Mammoth, Len Bias and Polynation. 7:15 p.m., free. TUESDAY >> Leave it to Canada to fuse punk and folk. The Weakerthans @ the 9:30 Club, with The New Amsterdams and Raising the Fawn. 7:30 p.m., $14. >> Three Stars alums…