For Thursday expect fairly stable conditions with winds from the North/Northwest bringing warm, continental air southward. The air will be somewhat dry, with dew point temperatures around 60 F (16 C), so heat index values should be relatively similar to air temperatures. Some low-to-mid level cloud cover may develop during the afternoon, but conditions will be largely pleasant through much of the day.
For Friday, conditions will look similar during the morning to Thursday, however a cold front approaching from the Southwest is expected to bring showers and/or thunderstorms to the region during the mid-to-late afternoon; expect slightly cooler maximum temperatures as winds will be from the East/Northeast ahead of the front. Once the front passes through, temperatures will fall to their coolest of the weekend, struggling to pass 70 F (21 C) on Saturday. Scattered showers will stick around through much of Saturday as saturated air moves in through the low and mid levels of the atmosphere; even without precipitation, expect overcast conditions to persist through much of the day.