Willingham was officially activated before the scheduled gametime, with outfielder Ben Revere optioned to Triple-A Rochester. Revere went 3-for-7 with a walk in two games in Willingham's absence.
First baseman Chris Parmelee was also scheduled be held out of action for the second straight game after being struck in the helmet by a fastball on Wednesday.
But it was only for precautionary reasons, as Parmelee has not suffered any concussion-like symptoms.
"Parmelee's OK," Twins manager Ron Gardenhire said before the game was called due to rain. "We're going to still back him up another day here. We've got a lefty going. I don't see any sense in it. He took a good whack. He's got a black eye. There was still a little swelling there. [Friday] they told me late in the game if I need him."