We were just there in early June. For us the weather was pretty consistent by being inconsistent. j/k
Most mornings were sunny but a little cooler. It would start to cloud up after noon and then typically rain in the afternoon. Most people we spoke to native native to the area said the mountain system makes it's own weather systems and what we experienced was fairly normal. We got rained on 6 out of seven days, but it was a short lasting rain (similar to afternoon So FL daily rains). We did experience hail 2 or 3 times, once while we had the top down on the Jeep.
Nights were certainly cool enough to wear jeans, sweatshirt, and have a campfire. Most nights we ran the heater to stave off the cool mountain air. Keep in mind for every 1000' in altitude you climb you will typically drop 3 degrees.
Hope this helps.
Doug