Rain or Shine is a live album by O.A.R. which was recorded on June 18 and June 19, 2009 at Charter One Pavilion in Chicago, Illinois. The live album includes all 37 tracks that were played during those two nights on a four–disc set with over four hours of music. Released on January 12, 2010, Rain or Shine is O.A.R.'s tenth released album, and fourth released live album.
On the second night, O.A.R. almost cancelled the show because of the rain and lightning. After a two-hour delay, Marc Roberge (lead vocals, guitar) said that they were literally minutes from calling the whole thing off but then they heard the fans chanting in the parking lot and they decided to have the show. The lightning let up, but the rain continued intermittently throughout the night. O.A.R. was able to perform a full set, despite having to make changes to their stage set-up because of the effect of the weather.