Take a step outside and feel the wind of change doing its job. By 10 p.m. Sunday evening, dewpoints — a measurement of moisture in the lower atmosphere — had dropped into the 40s/lower 50s for most areas — quite a contrast from 24 hours ago and the miserably muggy air over most of last week.
Drier air cools and heats quicker than moist air. This leads to sizeable diurnal temperature swings in the days ahead. Monday morning, lows drop into the lower 60s, but temperatures quickly warm into the 80s around midday and upper 80s in the afternoon.
It appears there will be a brief nose of elevated dewpoints returning to the state for a few hours around midday Monday. But this will be short-lived and quickly get displaced to the south Monday evening into Tuesday morning when low temperatures drop into the 50s.
If you like, you'll be able to give the A/Cs a break for many mornings this week. However, they may be needed in the afternoons when highs rebound to near 80° Tuesday and Wednesday.
Until Friday, most of this week will be dry with the lone exception being the potential of spotty lake-enhanced showers/thunderstorms Tuesday afternoon/evening. Model guidance suggests if these do develop, they'll most likely move over far eastern Indiana. For now, we'll mention a 20% chance of rain/thunderstorms.
But the combination of an approaching frontal system and increasing moisture brings better odds of downpours/storms on Friday.