The only time I've had condenstion inside a vehicle is when its left open on a humid night, or I've slept in it and water vapor builds up from my breath.
Open up the windows, drive it around or put a fan in it. If its real humid where you're at, use a space heater too. Does this happen a lot, or one time deal? If it's happening consistently you probably have water leaking into the cab from somewhere. Areas to check for wetness after it rains - Around doors, dash under the windshield, tub where the top meets the body. Also, check floorboard on passenger side. Could be a slow leak at the heater core.