My first trip to Moab was 3rd week of June. It ranged from 105 to 108. We were on atv’ s and you couldn’t pack enough water, plus there is little if any shade. April/ early May is ideal temp wise.Pupsocket, your drive is ~ 1400 miles, mine is ~1200 miles and I have a border to content with. I do not drive over 67 mph with my truck and camper so our trips are probably the same length in time. When I was working, I would leave right after work on Friday and drive until 10 or 11 PM. I would be up the next day a 5 AM and would be at Willow Springs late Saturday afternoon or early evening all pumped up ready to ride. I have been to Moab 7 times since joining the TW group, the last few trips have not been so rushed (Retired) and I have stopped at LT's and the Admiral's along the way. I would ride Sunday - Friday, all day every day and then on Saturday do a short ride and be gone by noon so I could be home Sunday evening. A week is really not enough time at Moab, but it is well worth the effort and expense.
June may be getting a bit too warm for riding in Moab. My first trip to Moab was in July and it limited how much I rode.
I do not like to trail ride when it gets into the 70s let alone the 90s. Moab got to 110 while we were there that summer.