It's just the water vapor in the hot air condensing on the cold air coming out of the A/C. Try opening your freezer door on a hot and humid day - same effect.

 

I'm probably the 5th person on the thread to say this, but it's no big deal. Happened so much in my first Honda, that when it DIDN'T happen in my last one, I thought there was something wrong with it. Simply water vapor condensation. Makes for a fun drive with your unsuspecting passengers... 'What the HELL is That?!?', they ask. I say 'Oh, that? Engine Fire. My S2000 can go to 9,000 RPM, but it normally catches fire well before then. No big deal.' The response? Always the same. 'You're kidding, right? RIGHT?!?

 

HUMIDITY...No worrries it is not a problem. I have had this in the 3 cars that I have driven. Plus I live in Miami so humidity is abundant.

 

I get it all the time.