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Well, it's never too late to cut holes in things
Seriously.
For instance (this is just one random example, there are oodles of things you could do) what if you opened up the bottom half of the wall on the usually-upwind side, just remove all or most of the siding and leave the studs exposed, and build a quickie little 'porch roof' there. It would only be maybe 2-3' feet above the ground, and whatever size you want but probably not bigger than <length of coop wall> by 4' or so. Enclose it very securely as a "reach-in run" style extension of the coop. Not only does this give the chickens more shaded area, it will help cool the coop and give lotsa extra ventilation without problems with rain blowing in. You could put plastic on some of the walls of it for wintertime if necessary.
Also, you might consider doing something to help funnel wind into your existing openings (window, door, vents, whatever you use). This is not always practical, it depends on the site, but often a short stretch of dense or solid fencing (or something like that) can be strategically located to funnel favorable breezes the way you want 'em to go. You need to have it engineered to withstand storm winds and think through its implications for *winter* winds, but in many cases this can be a useful help. For instance for horses it can often make a barn much more pleasant in the summer, or provide a sort of 'wind tunnel' with extra air movemnt to give them somewhere to stand to be cool and keep the flies off.
A solar attic fan is not going to do very much good. Especially for their price. It's not *nothing* but really as you are in a good breezy area it would just give you a lot more breeze to figure out how you can tweak the coop itsefl.
Just some things to consider, anyhow,
Pat
