I agree with okflyfisher -- it's best not to fish for trout when the water is that warm. Some of the streams around here got to about 70 degrees during the recent heat wave. I caught trout during that time by moving to streams with more springs that were running about 60 degrees. I also broke out the bass gear and went to larger, warm water streams. You might also be able to find spots on your favorite stream that are cooler where there are springs or cold water tribs entering the stream. This time of year (and in winter) it pays to carry a stream thermometer.