At game time, that is, increasing to 58% later. Furthermore, Wednesday's game is looking at a 58% chance of thunderstorms, and Thursday's a 43% chance of regular old rain.
I wasn't able to find the date of the last rainout here quickly, but I don't think there's been one in this millenium. So chances are they'll get the games in anyway.
I think I see tomorrow's Pregame Pick!