Dont know about going during summertime, except looking at some climate charts, it seems it can really get uncomfortably hot, especially in deserts of Iran and Pakistan. Monsoon rains might also be a problem once you get to the Indus valley.
We went from Greece to Turkey around Oct 25th, and the weather was quite tolerable all the way thru the country, maybe a bit too cold (around 8-10C daytime) in the east. Crossed into Iran November 2nd, and from then on it got steadily warmer, +20C daytime in Teheran, +25 daytime in Kerman. Nights were a bit chilly all the way until Quetta.
The critical part is getting through the mountain areas of northwest Iran and eastern Turkey. I wouldnt leave it later than end of October, as those parts will get snow, it wasnt far off when we went there.
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