He chose to pass on Moehler (0-3, 13.14 ERA) and start left-hander Jason Vargas.
"(Moehler) is the kind of guy you hate to look in the face and say we're going to skip you one, just because of how hard he works and the things that he does to prepare himself. You hate to do it. But we weren't able to predict the rain," Girardi said.
Moehler's next start will be Sunday against the Rockies at Dolphin Stadium, giving him 12 days of rest since his last start, April 17 in Cincinnati.
Mitre allowed two home runs to Howard in Florida's 4-2 loss in Philadelphia. Mitre got better as the game went on, but it was too late because Florida couldn't get any big rally going against Brett Myers.
"Howard beat him today," manager Joe Girardi said.
--With a 4-3 win Friday, the Marlins became the last NL team to win a one-run game. They are 1-5 in those games.
--In the tunnels inside Citizens Bank Park on Saturday, RF Jeremy Hermida ran for the first time since injuring his right hip flexor. He hopes to play Friday, a day after he is eligible to return from the disabled list.
--The Marlins have committed at least one error in each of their past eight games. They've made in error in all but four games this year.
BY THE NUMBERS: 13.50 -- RHP Brian Moehler's ERA, highest on the starting rotation and staff (through Sunday).
QUOTE TO NOTE: "It's embarrassing." -- Manager Joe Girardi, after his team blew an 8-5 lead in Cincinnati and lost 9-8 despite hitting four home runs.
RHP Carlos Martinez (sore right elbow) is on the 15-day disabled list.
RF Jeremy Hermida (sore right hip flexor) is on the 15-day disabled list. He hopes to return Friday (April 28).