The fans will help a lot with the heat. Do make sure to check them regularly for dust build up - especially the one pulling air out of the coop. Chickens are very dusty creatures!
A couple of ideas to add additional temporary shade to the run- When we first built our run, we used a shower curtain as an awning on the western side. We also sometimes used a beach umbrella in the summer to shade the southern side of the run. We have also leaned either plywood or a pallet on the western side as well for additional shade- not very attractive, but effective.
I would like to add that if by chicken wire you mean the traditional hexagonal wire, it is not at all secure. Our neighbor lost most of his flock to raccoons when they tore through his chicken wire like tissue paper. Once he replaced the chicken wire with hardware cloth, the raccoons were no longer able to get into the coop and run.
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