It happened to us, front seats, in October. But the worst by far, was a smaller drop 1/2 through the ride, NOT the final drop. As a matter of fact, we were laughing afterwards, because in our ride photo, we are ALREADY drenched, and that is taken at the top of the big drop hill (obviously).
For us, warm day, and it did not ruin the day. I think I may have changed my son's clothes, because I had spare set with me (adult but special needs). I was going to buy a shirt but powered thru and shorts and shirt dried ok. Did not really get our shoes too bad.