Drops of water dripping on my ankles today

[mistermac99]

Today I went for a 2-3 hour drive. It was about 85 degrees, and I had the top down with the AC running. I don't usually do this, but it was a very humid day.
Several times I felt a few drops of water hit my legs, around the ankle and shin area. Seemed to be worse when I turned a sharp curve, or turned into a driveway.
I noticed that when I was in traffic, the temp gage had risen by 5-10 degrees above the normal operating point.
After noticing this, I stopped and put the top up and never experienced this again.
Where would this dripping water come from, and why?
I would imagine it's condensation, but why would it drip on my legs?

BTW, this car sits in my garage, and is rarely driven when it rains. In fact, it hasn't seen rain for 2-3 weeks, so I know it can't be coming from the drains.

Anyone experienced this?