The weather for us was great summer-like weather - usually with highs in the 80's, although we did get into the mid 90's, but it did cool down at night sometimes to the 30's. The temperature difference between the higher and lower elevations is usually about 15 degrees.
Things we did did and saw:
Chisos Basin - We really enjoyed staying in the Chisos basin, which was an area of the park surrounded by a circle of mountains all around. I really need to show photos to explain. [I will post them when I am able to.]
Emory Peak - The highest peak in the Chisos Mountians was Emory Peak, at 7825 ft. We hiked this early in the week as a day hike.
Boquillas Canyon - We went for a short hike in Boquillas Canyon. There, we met a Mexican guy, Jesus, who was selling walking sticks, painted rocks, and songs.
Hot Springs - We went to the hot springs twice, and it was so nice with the water temperature at 105 degrees. It was a very nice 3 mile hike in from one trail head through the desert, up to the hot springs which was right on the Rio Grande. We could just step over the stone wall from the hot tub into the river.
Santa Elena Canyon - Near the end of our stay, we visited the Santa Elena Canyon that contains the Rio Grande River. This was a very nice easy walk, with the temperature much cooler and more comfortable than outside the canyon. The site of the canyon as it exits into the open is quite remarkable. I promise to post a picture as soon as I am able.
Campsites - We stayed at some pretty remote campsites out in the desert.