Hi Nancy,
I sure hope Mother Nature gets all the rain out of her system by the time you get here. On the other hand, I hear its been nice in Fairbanks, so you may luck out either way (smile).
You picked one of my favorite times of year to visit here. Lots less bugs, crisp late summer heading towards fall air ... maybe even a little snow on the high mountains. Have you been here before?
I live not far from the Parks Hwy, partway between Anchorage and Denali Park. It's a beautiful area. Hope you have a great trip - be sure to send us some pictures of your travels!
-Deb in AK