Welcome to the forum amoore!
Yeah, I'd say eek!
about 88-90 degree water, too! I'm not familiar with Grayson Lake, but it's probably a safe bet to say that with those water temps striped bass are most likely to be found in the deeper/cooler waters of the lake (near the dam?). I'd also check out the mouths of the rivers that feed the lake system to see if the water is cooler there, and check out the fingers off the main part of the lake where the water is in the shadow of the bluffs around sunrise. Just a wild ass guess, but if I were fishing the lake for the first time, that's where I'd be focusing my efforts first. I'd also stop in at Gifford's Outdoor Shop on Rt. 7, drop a few bucks and see what local advice they have to offer you