It's been another unseasonably hot and dry summer up here too. Way behind on rain and in another drought year.
My previous shop was built into a hillside with 3 sides 80% below grade and heavily wooded old growth trees for shade. The roof was a light beige color as well. The shop area was well insulated and even in 90 degree temps, it stayed 72 degrees inside, as long as I kept the doors shut.
My "new" place, the shop building has a dark green roof and receives direct sun most of the day. It gets mid to upper 80's in there, even being heavily insulated now. I gave up trying to work in there in that heat and ordered a mini-split A/C system, but who knows when I will get that installed. It's too damned hot to work on that too..