It rains all the time here near the FL panhandle so yeah I drive in the rain often. Have yet to have a handling problem of any sort, plus I it helps wash the bugs off, so.... hooray rain?

*EDIT: Just had to drive through a monsoon the other day on the highway, the kinda rain that makes you wish there was an extra-high setting for the wipers. Caught a little bit of water under the tires periodically at highway speeds, but the Challenger took it well and didn't feel unsafe at any point.