The league said it will continue to monitor the weather and "will adjust accordingly" if the forecast changes considerably.
"While we are expecting a chance of a relatively light amount of precipitation in and around the game window, current forecasts are indicating that we will have playable conditions," the league said in a press release.
The game, part of the NHL's Stadium Series, is scheduled to start at 8 p.m. ET. It will mark the in-state rivals' second outdoor meeting. The Penguins beat the Flyers 4-2 in 2017 at Pittsburgh's Heinz Field, home of the NFL's Steelers.