The National Weather Service says temperatures will be in the 90s across the state, but the heat and humidity will make it feel closer to 110.
There are just a handful of counties along Indiana’s eastern edge that are not part of the state’s excessive heat warning.
The rest of the state is under a warning about the dangerous heat until about 8 p.m. on Sunday.
Forecasters say people need to be careful, stay out of the sun and drink plenty of water.