I would go nowhere higher than 95F.
Now, for basking temp, I measure my chameleon body temp (using infra red).
in the environment temp 87 F, in basking mode, he can raise his body temp to 95 F.
He will start gaping if the environment basking temp reach 91 F.
"Temperatures are generally very high in Yemen, particularly in the coastal regions. Rainfall is limited, with variations based on elevation. The highlands enjoy a temperate, rainy summer with an average high temperature of 21°C and a cool, moderately dry winter with temperatures occasionally dipping below 4°C. The climate of the Tihamah (western coastal plain) is tropical; temperatures occasionally exceed 54°C, and the humidity ranges from 50 to 70 percent. Rainfall, which comes in irregular heavy torrents, averages 130 millimeters annually. In Aden the average temperature is 25°C in January and 32°C in June, but with highs often exceeding 37°C. Average annual rainfall is 127 millimeters. The highest mountainous areas of southern Yemen receive from 520 to 760 millimeters of rain a year. It is not uncommon for the northern and eastern sections of the country to receive no rain for five years or more. The Wadi Hadhramaut in the eastern part of Yemen is arid and hot, and the humidity ranges from 35 percent in June to 64 percent in January."