There are scattered storm chances through the week, but they will be quick hitting and more scattered to isolated in nature. First chance arrives this afternoon with a boundary stalled over northern Illinois and southern Wisconsin. A few mid level waves will pass over and this will fire up a few isolated showers and storms across northern Illinois and southern Wisconsin. The severe threat is low, but there will be a few gustier winds and heavy downpours in some of the storms that we have.
Once we lose the heating of the day, the threat for storms will go down, and most of the overnight will remain dry. By Wednesday we're in the 'warm sector' of the system with the low pressure well north of us in northern Minnesota. This will keep the very sticky air mass in place and keeps dew points in the upper 60's and low 70's which is more typical of mid to end July. High temperatures will again climb into the low 90's through the afternoon. With moisture and instability present, scattered storms will be possible in the with another incoming wave. Coverage of storms will be a little higher Wednesday afternoon.
A cold front passes early Thursday, and this will usher in drier air, though it won't be another cooler. It will be another day with high temperatures in the low 90's, but humidity will be lower.
Scattered chances return Friday into Saturday, but they will be hit or miss in nature.