Pooks -- yup, it tends to cool down a lot! 10:30 at night it may still be in the 80's but by morning, it's pretty much always below 70. On the other hand, when we get a 40+ degree change during the day, it heats up pretty quickly when the sun comes up! Once we hit 90 or so, though, things slow down, since there's usually not much more than 10-15 degrees to go!
That blow dryer effect, though -- it's amazing! Hot as can be, but it also DRIES us as we ride! I get a kick out of DH: he says he never starts sweating until we stop riding! A neat side effect of this dry heat is that much as I hate being hot, my body seems to love this climate for riding! Muscles and joints seem to really appreciate an afternoon ride, and I spend much less time "warming up" at the beginning of the ride!
Karen in Boise