Over a month into the regular season, the Mets rotation is finally starting to take shape.

With more bad weather expected Tuesday in Detroit, Buck Showalter said Joey Lucchesi would start the series opener against the Tigers, which will allow Max Scherzer to pitch Wednesday in warmer temperatures in his return from his 10-game foreign-substance ban, and Justin Verlander on Thursday in his season debut after being sidelined with a teres major strain near his armpit since spring training.

Showalter added Kodai Senga is scheduled to pitch back in Queens on Friday versus the Rockies.

Senga last started on Wednesday and the Mets are trying to take advantage of the schedule to give the right-hander extra time off as he adjusts to pitching more often in the majors than he did in Japan, where starters generally pitch once a week.

Carlos Carrasco, like Scherzer and Verlander, threw prior to Monday’s doubleheader against the Braves at Citi Field and Showalter said he is likely to rejoin the rotation next week after being out with right elbow inflammation.

They’ve been trying to survive with Lucchesi and Tylor Megill.

Showalter said he’s been impressed with Lucchesi, who pitched very well against San Francisco and was also effective against the Nationals in his previous outing.

David Peterson was less successful in his fill-in role and was optioned to Triple-A Syracuse on Saturday.

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Showalter’s message to the left-hander about what he needed to do in the minors was simple: “Pitch better.”

Peterson has a 7.34 ERA in six starts, with his slider much less effective than it was a year ago.

“There are a couple things we identified that are different than last year that he has to get back to,” Showlater said. “He’s 27 years old. He knows he needs to start grasping some of these things. He does. He will.”