Cool dry air rotating around low in Eastern Canada. Another upper low in Pacific Northwest. All of these systems will weaken and allow for warmer weather nation-wide next week.
Map above is for late Saturday. Front over Great Lakes coming south and may cause a shower in The East Sunday. Low in Missouri will produce more widespread unsettled weather next week. West - mainly dry and warm.
Rainfall amount from MOnday - Wednesday next week. Once again..Eastern half of The Nation - wet...West dry...with exception of Arizona.
Above...upper air map for late next week. Notice high pressure in Gulf States. This ridge will send the jet stream up north and allow for the warmer weather. So August may take a stab of real summer weather before exiting. Have a nice weekend.