Notice first time that a large amount of water on inside of front window, not like a mild fog or dew that one gets from time to time. It was very cold here in Florida when I noticed this for the very first time today. Had to use a large towel to get it off, not just turning on the Heat/Fan like I normally do. Link below from a new 2015 Buick Encore owner has the very same issue. Anyone else ?

I should have taken a picture, but it was too early (dark outside)

Windshield Condensation Issue

 

I haven't seen this, but like you we can go days without using the car.

 

If you have high humidity then have a sudden drop in temperature, you can get condensation inside the car.
We just had a very wet spell here in central Florida (7 plus inches of rain in two days) followed by a good cold front (30 degree temperature drop).
The next day my 08 Fit smelled like it was damp inside, but I found no water leakage signs inside as nothing anywhere was wet.
But yes, there was a thin film of water on the inside of the front windshield.
Gregg

 

I used the car today and saw no evidence of water having been on the inside of the windows.

 

Mine had a little bit, but not as much as a couple of days ago, and went away rather fast with the fan cranked up. Mine is outside all the time.

 

Mine's outside too, but under a carport (Patrician Oaks).

 

The Fit's windshield is very inclined which presents a lot of area to radiate to the cold sky on a clear night. If the air inside the car is humid (particularly if it has been raining and you've brought moisture into the car) it will condense on the cold glass. The Fit windshield is a big piece of glass and the top of it is a long way from the defog vents so it takes a while to clear.

More upright windows don't get as cold and have less fog/frost problems.

To prevent this problem, park under a structure or throw a blanket over the windshield. This insulates it from the sky so it won't radiate its heat away.