I agree with Victor. I had my group of merumontanus and montium outside today for most of the morning and afternoon, and I had to be out there every 20 minutes to check on them. Even though the temperatures at the time ranged from 88-95, I was able to keep their ambient temperature in the low 80s by placing their heavily-planted enclosures (Reptariums®) under the trees (receiving only filtered sunlight), and by providing them with a gentle shower for at least 2 minutes at a time (every 20 minutes). Their enclosures are quite portable, so I bring them outside once ot twice a week.
My animals begin showing signs of stress above 85 degrees (these are, as some people call them, "montane" chameleons), but your calypratus come from a hotter weather in Yemen. Even then, you should carefully monitor their response to the heat, as Victor said, by providing PLENTIFUL shade and lots of water. The higher the temperature, the more water they will need.
Having said that, the stress that your chameleon is experiencing could not only be due to temperature, but also to the change in light intensity, the fact that it has been exposed to more open place where birds fly above them, wind, etc. Remember that even though you may have high intensity UV bulbs indoors, the UVA, B, and C radiation from the sun is hardly comparable. Also, the spectrum (color of the light) may be very different, and reptiles are VERY sensitive to these changes.
You may want to do this gradually, bringing out the chameleon outside for a short period of time in the morning, and placing it back in its indoor enclosure for the rest of the day. I realize this may constitute unnecessary stress, so evaluate your options.
Good luck,
Fabián