Temperatures and dew points have been quite high over the past few days. That will completely change by the time we get to Wednesday afternoon. A strong Canadian high pressure system will anchor itself north of Lake Superior beginning Wednesday. It won't move much at all through Saturday, which will keep our pattern very quiet. It will also allow cooler, less humid air to filter into the Midwest and Great Lakes.
Temperatures won't exceed 80° until potentially Sunday afternoon when our winds start to turn southerly again. Humidity values will be low with dew points in the upper 40's and 50's, which will make it feel much more fall-like as we enter September on Thursday. Clouds will be few and far between Thursday, Friday and Saturday. The next chance of rain arrives just in time for Labor Day Monday with an approaching cold front, but that system is still too far out to pinpoint any details at this time.