We have made many annual trips to New Mexico in late July or early August. Although the days are hot, it is dry, and the early mornings are quite cool and comfortable. If you find shade, you could paint quite a while before feeling the heat in early afternoon.
I always looked forward to these times of quiet and solitude. I might see elk or deer, and once, a small flock of wild turkeys were peacefully pecking at the ground behind me.
I am still amazed at the variety of landscape and in 360 degrees, one could paint very different landscapes. Sandstone formations dominated, with mesas and mountains and vast valleys below.