The fishing in Nor. Cal and Oregon are better than in Georgia. I know that because I am a Georgian that lived out there and has made a number of trips beyond that time out there. There is no reason for a westerner to kill himself hauling equipment on an airplane to fish the streams in Georgia. The Chattahoochee below the dam produces some of the biggest streambred fish in the state, there are operations that produce pellet pigs as well. In summary, the trout fishing is not going to be something unique that you can not surpass closer to home. The S. Holston up in TN is better and some streams in NC as well, but they are all a pretty good haul from Atlanta proper.

The better fishing that GA would have to offer at that time of year would be a striper run in the rivers or, to do something unique that you cannot surpass at home, you might want to look into fishing the Flint River sw of Atlanta for shoal bass. You can float and wade and the heat won't seem as bad.