I'm afraid we here in Austin, Texas are in somewhat the same pickle as bikegeek57. Supposed to be in the 90's today (as it was all weekend) with nary a chance of rain. The Borneo-like humidity hasn't set in for the long haul yet, but its just a matter of time.
Around here during the summer you ride early in the day, you ride late in the day, or you wonder why that "I smell pork frying" smell is coming from beneath your helmet.