Not that long ago weather couldn't be accurately predicted much beyond the same day, and many of us who have been camping and or RVing for a while headed out anyway. For us the unknown was part of the excitement. Granted, greater information today often comes in handy, but also comes at a price.
I've never planned an RV trip around weather -- beyond seasonal general expectations anyway. And if I did I'd probably get it wrong. The only trip I've taken weather into account was to hike across the Grand Canyon, so I picked a dry month with moderate temperatures. With my luck a severe thunderstorm came through which also dropped temperatures a lot; but it also made special memories. In retrospect I would not trade our hike for a normal day.
I agree with others. Go, remain aware of weather daily, enjoy, and stay safe.