Based on my experience in Chicago last year, I'd practice running 20+ miles in 90+ degree heat with no water...Okay, I'm done whining about that. :-)
I'd surely suggest running with water, and wearing good, wicking clothing. If you are up at 4am, then you're doing the best you can, and may just have to deal with the fact that the end of your runs are going to be warm. Can you plan the end of runs to be in shaded areas? Planting water on your route has always worked for me. The other option is to split long runs in half, so run 7.5 in the cool of the morning, and another 7.5 in the cool of the evening.
Good luck man!
E
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2008 Half Ironman Training Log
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