Exhaust smoking

I have a 2005 Hyundai Elantra with a 2.0 liter cylinder in it. I changed the oil earlier today and went to take it on a ride but noticed while I was waiting at a stop sign that there was thin smoke or steam coming from the exhaust, I checked the oil and the coolant and everything looks fine so I was wondering if anyone had any idea what it was? It was raining and was about 50°F outside when I drove it if that makes any difference.