Last year driving up there on Friday in the rain was the biggest problem for me... I had never driven my truck more than about 15 miles at one time before, and suddenly I'm driving it the last 80 miles or so in the rain with no wipers... Was a big adventure.
Seems like every year at Round Up in the afternoon there's a gray cloud that blows in, gets windy, makes everyone nervous, maybe sprinkles a little, and then moves on without much more drama. There was hail on Saturday night last year too- we hunkered down and drank some beers in the hotel rather than go out to cruise.
Definitely gotta love Texas weather. Don't like it? Wait a few minutes...