It has been in the 90's quite often all the way to Lake Superior this summer, so depends on when and how much of a break from what type of heat you are needing. If you make it up here, please keep in touch. There are some great places up on Door County (the "thumb" of the oven mit of WI) and off the tip on Washington Island. Those places should be cooler temps. lots of vineyards and nice scenery.
