We are riding from Spokane to San Diego mid June and thinking of highway 395 south to 15 in ca. and in to San Diego. My ? is about temp. Is 1 route hotter than the other? My other option is 95 to Boise, 84 to Twin Falls s. on 93 to Las Vegas on to 95 to Yuma on to 8 west to San Diego. I have taken highway 5 before and found it very boring. Both these routes will take longer than on a major freeway but we want to see more than someones bumper for 2 1/2days.