I've read that, at the level where official temperature readings are taken, the hottest possible air temperature due to weather is between 131 - 133 degrees Fahrenheit. This seems awfully low, considering how hot surface temperatures can get in the Lut Desert, Iran -- close to 70 degrees centigrade. I'm sure if they set up an appropriate weather station in the middle of the Lut, they'd measure temperatures much above 133 degrees F.
The current, official hottest temperature on earth is 129 degrees F, recorded at Furnace Creek, Death Valley, Ca. in 2007 and on a few earlier occasions. The previous record was held to be 134 degrees F, at the same location, but the thermometer was later determined to have had been too low (too close to the ground) to qualify it as an official reading. Another extreme temperature often cited is 136 degrees F in Aziziya, Libya. That reading was taken over a tarred concrete surface, which means it is highly inaccurate.
So I think the Lut would have the highest possible temperatures given how the surface temperature reaches 70 degrees centigrade there. With such high surface temperatures, how hot can the surrounding air get? If I were to guess I'd top it off at around 137 - 141 degrees F. What do you all think?